Do-it-yourself Citroen c4 repair

In detail: do-it-yourself Citroen C4 repair from a real master for the site my.housecope.com.

The Citroen C4 car first saw the light in 2004, and not in vain, because to this day this car still meets the declared reliability and safety indicators compared to other cars of the same class. At first, relatively inconspicuous, with each new version of the Citroen C4, it began to contain more and more new features. The latest versions of the car are thoroughly “stuffed” with various electronics, which sometimes helps out, but sometimes ruffles the nerves, and then the repair of the Citroen C4 becomes necessary. But first things first.

Note that Citroen repair, or rather its necessity, in some moments depends on the configuration of the car. So, the following versions are included in the line of this "Frenchman":

Classique
Confort
Exclusive - a variation for a hatchback
VTR, VTR+ and VTR Pack - coupe variation

As for the correct choice of model - this is a personal matter for everyone. Repair of the Citroen C4 Picasso through the time of operation may be needed in the same way as the Citroen C4 Cactus. Therefore, the essence is not so much in the principled choice of model and configuration, but in the knowledge of the weak points of the machine, which, in turn, sometimes need to be paid attention to.

I would like to note in advance that, in general, the Citroen C4 is a prominent car with excellent characteristics both for driving in the city and beyond. But in this article, we will pay more attention not to the advantages of the model, but to the disadvantages, so that potential buyers can see the full picture of the technical capabilities of the machine.

So, Citroen C4 repair is very often associated with automatic transmission malfunctions. Sometimes the valve stops holding, sometimes the entire valve body fails, and it also happens that the band brake completely breaks, as a result, the box simply wedges. No matter how manufacturers fight over this problem, they cannot fully solve it. Therefore, often lovers of the C4 model wisely choose "mechanics".

Video (click to play).

Sometimes a visit to a Citroen C4 car service in St. Petersburg is required due to the failure of the electric seat heating system. The biggest "boom" of this problem occurred in 2008. However, not often, but from time to time, this defect occurs in new models. This is due to the elements of the backrest and cushion system connected together. Therefore, when at least one posting is frayed, the entire system stops working.

The rest of the breakdowns, due to which maintenance of the Citroen C4 is necessary, include the periodic shutdown of the engine temperature sensor, frequent malfunctions of the headlight washers. Yes, and with the generator, mainly due to the effects of chemistry, which road services scatter on the roads, struggling with ice, problems begin in three or four years.

And so the car, of course beautiful, the designers did their best. But you won’t be full of beauty alone, so do not forget to carry out timely maintenance of the Citroen C4, and periodically look at nodes that are prone to weaknesses.

Debut. 2004, Geneva. In 2006 model

BODY. 3 or 5 door hatchback

gasoline -1.4 l, 90 hp; 16 l, 110,120 and 150 hp;

diesel -1.6 l, 90 and 110 hp; 2.0 l. 140 hp

Oassique, Contort, Exclusive. VTR, VTR Pack.

TOTAL DEPENDENCE (Oil change)!

Iodine by the hood you immediately pay attention to the warning sticker: the manufacturer recommends operating fluids only of the Total brand. It will not be difficult to buy them in the metropolis, but in the provinces there may not be any. And if the nearest dealer is hundreds of kilometers from home? Then use liquids of other brands, but be sure to have similar properties. For example, the class of synthetic motor oil must be at least AZ / B4, and mineral water - C2 (according to ACEA).Viscosity index but SAE not lower than 5W-30 for middle and southern latitudes and 0VV-30 for northern ones.

Mining is drained from a warm engine by unscrewing the plug in the oil pan. The edges are very low, and the open-end wrench can “lick” them, so it’s better to work with a “24” head or an “8” tetrahedron - there is a recess in the cork under it. When replacing the filter cartridge, be sure to change the sealing ring (you will find it in the original kit). In order not to turn out when screwing on the cap, lubricate it. We twist the cap with a torque of 25-30 Nm and, of course, exactly along the thread - I warn you, because you can blunder.

There is no dipstick or control plug in the MCP. This is bad, because if oil leaks through the crankcase seals or oil seals, then it is not clear how much to add it. Another thing is if the unit is sealed. Then, unscrewing the drain plug with a “21” key or a “8” square, drain everything to the drop and pour exactly 2 liters of fresh oil through another plug (it is on top of the crankcase). Then, as the manufacturer assures, the level will be normal. According to the official regulations, the oil cannot be changed, but, according to experience, it should be changed every 100,000 km.

The machine also does not have a probe and a control plug. Here they are replaced by a futorka for a “8” hexagon, which is located under the plug on the pallet (it is for a tetrahedron on). Having unscrewed both of these parts on an idle engine, we drain the mining into a measuring container, after which we screw the futorka into place, and then the plug. Through the inverted breather (or a plug on top of the crankcase), fill in fresh oil in a volume of 0.3-0-5 liters more than the drained one and start the engine. After warming it up to 60 * C, we translate the box selector in all positions with a 2-3-second delay in each of them and, leaving the growl in position P, unscrew the drain plug (do not touch the futorka!). The excess will merge, and only the right amount of oil will remain in the unit - along the cut of the upper opening of the futorka. By the way, but according to the previous regulations, the oil was considered “eternal”, but due to the frequent failures of the AL4 box (aka DP0 for Renault and ALA for Peugeot), the first oil change is now provided for 15 thousand km. and the next one is recommended for a run of 90 thousand km. Dealers do not change the filter, rightly believing that the unit will not live up to the third oil change anyway. Say, then, when the box is completely disassembled, we will change the filter, otherwise it is not easy to get close to it - it is behind the pallet and the hydraulic plate.

Have a wide container ready before changing the coolant. There is no drain plug in the radiator, so we will drain it by removing the lower pipe. At the same time, you run the risk of spilling and scalding.

Of course, you can wait until the motor cools down, but then the thermostat valve will open and some of the liquid will remain trapped. However, this part is small. After filling the system, do not forget to remove air plugs from it! For this, two valves under blue caps are designed - one in the heater pipe (near the bulkhead of the front panel), the second on the thermostat housing.

We change the air filter: having released the latch, we pull up the plastic resonator of the air duct, simultaneously removing the corrugation from it. We unscrew the filter housing bolt and loosen the pipe clamp on the throttle assembly. Now we remove the brake reservoir, unscrewed a couple of screws under - Torx-20, and take it aside.

Shaking the body up and down, we shift the pipe from the throttle assembly and take out the body. We turn out the screws around the perimeter and, having removed the cover, change the element. When assembling, make sure that the pipe fits snugly on the throttle assembly!

To replace the spark plugs, unscrew the six self-tapping screws of the engine trim and four bolts of the ignition modules. We remove the crankcase ventilation hoses by pressing the yellow tip retainers. Having lifted the module so that the tips come out of the candle wells, we lay it across the valve cover - in this position it does not block access and is held on the wiring (the connector was not disconnected). Candles - turnkey for 16 ".

There is an automatic in the drive of Attached units, which is great - you can't go wrong with the belt tension force!

For a timing belt, about the same device, but semi-automatic. To set it to working condition, you need to combine the arrow on the movable sector with the front sight on the stationary one. If you have had to change a belt with a similar drive pattern, there will be no difficulties. Another thing, according to the French tradition, there is not a key or a pin in the pulley-crankshaft connection. That is, by unscrewing the central bolt, you can endlessly select the correct position of the shaft with the pulley. Here you can not do without mandrels! There is nothing special about them: drills are also suitable for fixing the camshafts, and a more or less experienced car mechanic can make a hook for the crankshaft from a 6 mm rod. But it is better to entrust this work to specialists.

At the same time, let them change the rear pads - here you need devices for screwing in pistons, which not everyone has. Moreover, in the mechanisms of the Bosch company (they were installed before 2006), the pistons have to be turned in different directions, which means that two devices are required - with a right-hand thread and a left-hand one. It is easier with the front pads, it is only important to orient them correctly: the bevel of the lining should be on top. Of course, do not forget to clean the assembly of wear products and lubricate. And change the guide bolts - they, with locking sealant on the threads, are supplied in the original kit.

Changing the bulbs in the headlights, at first glance, is not difficult. It seems that access is normal, and it is easy to remove the rubber plugs of the case. This is confusing: when some kind of headlight bulb burns out, the owner takes over. It wasn't there! The block sits so tightly that the effort of the fingers is simply not enough, and sticking the brush in order to grab it tighter doesn’t work - it’s not enough. So I want to pull off the connector with pliers. Do not rush - you can easily pull out the landing clip on the reflector with the root. It is better to make the simplest device: we bend a strip of steel 1.5x10x150 mm and form a hook, sharpening the tip on emery under a wedge. We push it into the gap between the block and the lamp and, shaking and moving the mandrel along the perimeter of the block, gradually move it from the lamp. And to understand the principle of fixing the lamp, we use a mirror.

With foglights, the same trouble as on many other cars: there is a lot of dirt in the work area. In addition, here it is necessary to remove the bumper skirt - unscrew seven bolts under the "Torx-20", three turnkey "by 10" and also squeeze out a couple of latches. It is extremely inconvenient to work without a lift.

We remove the lanterns to replace the lamps - sadly, this is the modern trend. Having removed the pockets And taking out two pistons in the trunk lining, bend it and unscrew the plastic lamb. It may not go by hand, and then it is not a sin to use pliers. At the five-door we also remove the reflector, and at the three-door we overcome the grip of the additional lock, pulling the lantern out of the seat.

The maintenance of this machine is below average pleasure, it is the result of the current general tendency to complicate those operations that should be extremely simple. Involuntarily a guess is born; and if so, so that dealers do not remain without work?

SOME REPLACEMENT WORKS

Item name Periodicity thousand km (years)

Engine oil, oil filter 15 (1);

Antifreeze in the cooling system (5);

Fluid in the brake drive (2).

-** - Control at each MOT, replacement according to condition;

-*** - Recommended after 100 thousand km.

APPROXIMATE COST OF INDIVIDUAL WORKS AT DEALERS

Job Cost, rub (USD)

Computer diagnostics of the engine - 800 (27);

Change of engine oil and filter - 640 (22);

Replacing the air / cabin filter - 640/500 (22/17);

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Turbine repair on Citroen C4 Picasso 1.6 HDi

Repair of automatic transmission DP0 AL4 Renault, Citroen, Peugeot

Citroen C4 steering rack repair. Citroen C4 steering rack repair in St. Petersburg.

there is a hole like this:

Image - Do-it-yourself Citroen c4 repair

we pull it more boldly, open it and pull out the filter. As you can see, the filter turned out to be crumpled, they shoved it into the OD and FSUs, otherwise I think it’s so dusty in the cabin!

We carefully insert the new one so that it closes the intake well, you can visually check, the hatch is in place, the noise is in place.

Now the air filter, it’s certainly more difficult here, at first I was tired of how to unscrew the far screw

BUT I went the wrong way, the filter must be removed entirely, but I wanted to open it on the spot, we remove the battery, I threw out the casing from it a long time ago, so it doesn’t take long to remove it, the air intake is also removed for a short time, twist the corrugation clockwise and pull it out, but he himself is attached simply to the latch:

We also unscrew the brake fluid reservoir, now access has become better, unscrew the bolt holding the filter housing:

disconnect the air vent by pressing the "yellow":

nothing else holds it, carefully take it out and open it without worrying, I brought it home, cleaned it of sand, inserted a new filter.

Now the candles, remove the lining from the engine (6 screws), disconnect the air ducts by pressing the "yellow" so as not to interfere

unscrew the block with candle caps (4 screws), take out this block

we take a candlestick and unscrew the candles (I broke one key, took a reinforced one, they were tightened to the conscience!)

Candles, in principle, are working (36,000 passed) - they have a coffee color (leave it, it will suddenly come in handy!)

And now everything is in reverse order, slowly, with feeling, really with the arrangement!

I still have front brake pads (I also think I will replace it myself), I decided to try “TEXTAR”, because relatives creak terribly, I took these at random, but I hope for the best, the company seems to be normal and there are also rubber bands on the brushes (not native, but they fit), I will change them closer to spring, now I don’t see the point:

and if anyone is interested, here is the invoice for spare parts (2008 prices):

oil, I went to replace it at the station, it was reluctant to remove the armor, they sucked it for 200 r, to unscrew the oil filter you need a head on “27”, now everything seems to be ... Perhaps someone will come in handy!
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One of the specializations of our stations is the quality repair of the Citroen C4. In our car services there is a specialized tool for repairing Citroen C4. In the presence of consumables, oils and fluids necessary for scheduled maintenance. Within a couple of hours, from the main warehouse we will bring any spare parts for the repair of Citroen C4.

Before starting the repair of the Citroen C4, we will make free diagnostics suspension, engine or electrics (free diagnostics in case of repair at our service stations). We do not recommend do-it-yourself Citroen C4 repairs. Everyone must do their job. You need to entrust the repair of your car to those who do it every day.

Citroen C4 repair cost:

Routine maintenance and maintenance of the Citroen C4 is recommended to be carried out every 7-10 thousand km. run. This includes changing the engine oil, oil filter, air filter and cabin filter. When carrying out planned work, we will make a free diagnosis of all components of the car and make a list of recommendations.

Every 60 thousand km. mileage, we recommend changing the timing belt with rollers, and if the motor is chain, then it is better to replace the chain every 120 thousand km. It is better to change candles every 40 thousand kilometers on gasoline engines and 100 thousand kilometers. mileage on a diesel engine. On Citroen C4 models with adaptive throttle, it is recommended to clean and adapt the throttle every 60 thousand km.

The most famous problems and malfunctions of the Citroen C4:
– acidification of caliper pistons with subsequent uneven wear of pads and discs;
- unsuccessful design of the fuel filter - the car twitches, stalls, troit;
- creaking in the car interior associated with low-quality plastic - sizing with anti-creaking material;
- a problem with the box - an early failure of the bearings and seals of the input shaft;
- in standard cooling radiators, leak at the junction with the side part;
- a tight steering wheel - a problem with the car's power steering - a bulkhead or replacement, according to the diagnostic result.

The degree of wear of the Citroen C4 hub bearing can only be determined during diagnostics.

Warranty on all repair work Citroen C4 - 6 months.

The service life of Citroen automatic transmissions is one of the smallest in the class of passenger cars. The outdated AL4 transmission has been produced since the late nineties and during this time has not been brought to mind. The high risk of failure reduces all its advantages to almost zero.

One of the worst enemies of all Citroen automatic transmissions on C4 and C5 cars is overheating of the box when driving at high speeds. In this box, everything can overheat and fail: from the mechanical part to the valve body and the electronic control unit. Overheating usually results in a whole range of problems from interruptions in pressure inside the box and abnormal operation to failure of its individual parts.

The second enemy of this automatic transmission is dirty and old oil. If it is not replaced on time on C4 and C5 cars, the inside of the box will become clogged with various debris, which will lead to oil starvation and subsequent failure of its various parts.

Despite its racing past, Citroen is now focused on the mass production of cars focused on quiet urban operation.

With an aggressive driving style, with quick starts from a standstill, chaotic gear shifts, constant braking on C4 and C5 cars, the gearbox life goes out very quickly.

Despite the fact that the design of AL4-DP0 is very simple, rational and there is nothing superfluous in it, it easily fails. This is due to excessive savings on materials for the manufacture of everything that is inside the box. The low cost of cars C4 and C5 with this box provided the habit of using a car with automatic transmission in Europe. At the same time, services and craftsmen were forced to appear in Europe, who quickly learned how to return these transmissions to service.

Automatic transmission AL4(DP0) for Citroen cars

The AL4 is designed with a heat exchanger to cool the oil temperature. This organization scheme means that the box operates under critical temperature loads. In hot summers and in traffic jams, it overheats mercilessly, the electronics and the valve body suffer. Using it at high temperatures quickly disables the elements of the box. Although at temperatures not higher than 90 degrees, this box is able to work for a very long time.
The torque converter clutch lock on C4 and C5 cars is already activated from the second gear, this somewhat reduces heating, but wears out the torque converter clutch more and pollutes the oil with its decay products.

Contaminated oil transfers the particles of the box mechanisms directly to the heat exchanger, where they successfully settle and pollute it, reducing its throughput and heat transfer. The heat exchanger stops cooling the oil, the transmission temperature rises and the valve body with solenoids starts to work very badly. This problem is solved by replacing the heat exchanger with a radiator paired with a thermostat. Cleaning or replacing the heat exchanger is not advisable. In the first case, this solves the problem for a very short time. In the second, the heat exchanger is too expensive and the new one will quickly litter anyway.

Despite Citroen's claim that it is not necessary to change the oil in new models of their cars, experts say that this procedure is needed every 200,000 kilometers. Oil for AL4 is selected mineral and it is inexpensive.

Dashboard in a Citroen C5 car

However, there is some truth in Citroen's statement. On C4 and C5 cars, you can really drive without changing the oil, just with a good load after 200,000 kilometers, instead of oil, you will need to change the box assembly.

Electrically, the AL4 also lacks weaknesses. Among the leaders in replacements, the leading positions are occupied by electric pressure regulators and solenoids. They have design flaws and frank flaws immediately upon release by the manufacturer. Their replacement is obligatory at the first intervention in the box. Usually the most problematic solenoids should be replaced: the line pressure solenoid and the torque converter lock-up solenoid. You should not replace them with original ones - they have not been produced for a long time and in boxes with “originals” the car owner will find cheaper analogues. Sellers at the same time shrug. The solenoid responsible for pressure regulation is the first to fail, the box overheats and the valve body slowly kills. Along with their replacement, it is better to change the bushings - this will provide the solenoids with a longer service life. The remaining six solenoids usually have a very long life and do not need to be replaced.

Valve body AL-4 for automatic transmission Citroen

Plain bearings (bushings) in this automatic transmission act as seals. The wear of the bushings leads to a whole bunch of problems: they leak oil, the packages begin to experience oil starvation, the electronics try to saturate everything with pressure by opening the valve to the full, the pump and pressure solenoid begin to die before our eyes.

In addition to all this, friction clutches are also killed. If this operation was not carried out before the first problems with the box, it is better to change the entire set of bushings. Bushings should be put non-original.

The valve body of this box is the main sufferer from overheating and contaminated oil, it clogs easily. A metal plate can overheat so much that its metal is deformed and breaks some of the mechanisms inside. Moreover, this equally applies to all possible modifications of the valve body for different engines of different years of production of these cars. From pressure losses, frictions begin to slip and wear out. For their complete failure, several hours of operation of the box in burnt oil are enough. Frictions made of compressed paper are erased and clogged with chips, the same, long-suffering valve body. If the block is dirty and has already ridden on burnt oil, flushing it will not work.Repair of the valve body and electrical part of the Citroen automatic transmissionWhen overhauling, it is necessary to check the geometry of the hydraulic plate body. Until 2011, when the block was deformed, the bolts of the upper layers of the hull were also deformed. If the valve body is still out of order, it is easier and cheaper to replace it with a new one.Together with the clutches, the brake band also suffers from dirty oil. It is better not to subject cars with this automatic transmission to slipping in snow and mud. Long driving with a faulty brake band and piston wears out the drum of the third pack.DON'T SPEND MONEY ON REPAINTS!
Now you can remove any scratch from the body of your car in just 5 seconds.Among stuffing boxes and seals, the pump cuff usually fails first. If there is an oil leak, then most likely replacing the seals and gaskets will not help. This is a symptom of wear on the torque converter bushings and there is no way to get rid of a cheap replacement of oil seals.In terms of consumables, the undisputed leader is the second gear clutch package, the first package burns less often.The latest in the list of repairs are the planetary gear set and a reliable back cover.The repair of this box is well known to craftsmen around the world, most of them learned all the intricacies of automatic transmission repair on it. Spare parts, repair kits and consumables are usually available in stores and can be obtained within a few hours.In order for the automatic transmission not to fail ahead of time, it is enough to follow the simplest rules and recommendations.

Always, even in summer, warm up the box before any trip. Even if the car stood for only a few hours in warm weather. Oil must pass through all the insides of the box before starting.

Before starting a trip, drive the gearbox through gears, lingering in each position for at least 30 seconds.

Avoid high engine speeds for the first few kilometers.

With active driving, especially in summer, avoid overheating of the box and slippage.

If the stop time is more than 2 minutes, switch the selector to park or neutral. If stopping takes less time, in no case do not switch the selector to neutral.

When driving in winter, it is better to drive the first kilometers in winter mode (snowflake).

When parking on a slope in winter, first turn on the neutral, then the handbrake, and only then the parking position.

Parking a car in winter on a slopeMost of the repairs occur due to violations of operating conditions, the driver’s lack of understanding of the features of driving a car with an automatic gearbox, and untimely oil changes. It's better not to check how far the box can go if you don't change the oil. Moreover, the replacement procedure itself on C4 and C5 cars is very simple and anyone can do it with their own hands in the presence of a garage or overpass. If this is not done, then very soon the car owner will be waiting for the Citroen automatic transmission repair. The remaining repair procedures should be entrusted to experienced service station specialists.

In order for your Citroen C4 to serve faithfully to its owner, you need to constantly monitor its technical condition. Regular diagnostics and repair of the Citroen C4 is the key to trouble-free operation.

In order to repair the Citroen C4 less often, you must first of all monitor the consumables, which change either after a specified period or depending on the mileage. Checking and replacing consumables on the Citroen C4 is done according to the scheduled maintenance table, which indicates the intervals with the mileage and the type of work.

Citroen C4 repair and replacement of consumables includes:

Change the oil in a Citroen C4 engine
change oil filter citroen c4
Change the cabin filter on a Citroen C4
Change the oil in a Citroen C4 automatic transmission
Change power steering fluid Citroen C4
Replace antifreeze with Citroen C4

Timely replacement of oil and filters on the Citroen C4 will significantly reduce the cost of repairs in the future. A clogged air filter will not allow the required amount of air to pass through the engine, causing it to choke and consume more fuel.

Repair service for popular Citroen models:

repair Citroen C4 2.0d;
repair Citroen C4 1.6d;
repair Citroen C4 1.6;
repair Citroen C4 1.4;
repair Citroen C4 2.0;

If you do not change the oil for a Citroen C4, then it will lose its properties, become very cloudy and thick, turning simply into a thick substance, that is, fuel oil. Such oil does not lubricate the moving elements, but only hinders their work.

The price for repairing a Citroen C4 consists of the following components:

Prices for Citroen C4 spare parts for repair;
Price for the work of a car mechanic / specialist;

The most expensive are original spare parts for Citroen C4 from the manufacturer. Each such spare part has its own part-number, by which you can find analogues from other manufacturers. The prices for non-original spare parts for the Citroen C4 are lower than the factory ones, but there is a chance to get a low-quality fake that has a short service life, or will not work at all. Filters, oils, candles, belts, brake discs for Citroen are most often faked, as there is always a demand for them.

Types of payment for the repair of Citroen C4:

official, with documents and a guarantee;
informal, without documents, by personal agreement.

First of all, it is necessary to clearly set the tasks for repairing the Citroen C4, and if the problems are not obvious, then diagnose the Citroen. Car enthusiasts-dummies are always welcome in the service, because they can be imposed a number of works and replacement of spare parts that are not necessary.

In a car service center, Citroen C4 repair prices can be fixed for each type of service and be the same for all car brands: suspension diagnostics, oil change, pad replacement, air filter replacement. An alternative price option, when payment is made for “1 standard hour”, it has its own for each car model.

In this case, each Citroen C4 repair operation is determined by timing, that is, the time it takes. This is called "Rationing of labor costs". Each automaker indicates these figures in the tables of directories for each car model separately.

It often happens that repairing a Citroen C4 by a mechanic takes more time than the standardspecified in the labor guide. In this case, you have the right to pay only the fixed standard hours allocated for this operation. Whether the automaster will do this slower or faster depends on his qualifications.

It is very important to demand the issuance of a work order for the scope of Citroen C4 repair work you have chosen, as this will avoid disagreements, show your awareness and be a significant argument if something goes wrong. Specify what to do with the old parts after replacement: return them to the client (that is, you), or the car service will dispose of them on its own.

The ideal option is not to give anyone, under any circumstances, the keys to the carand only drive yourself. Fully control the repair of Citroen C4, being in the working area with the mechanic at all times.Such conditions often contradict the safety precautions of a car service, but this will save you from most problems, and the repair service will be as transparent as possible.

If for the repair of the Citroen C4, according to the rules of the car service, it is required to hand over the car, then be sure to draw up an act of accepting the car for repair. This procedure involves the transfer of a car key, and often a registration certificate. An employee of a car service independently drives the car into a box, or onto a lift.

The Citroen C4 acceptance certificate for repair or diagnostics includes:

List of works and malfunctions required for car repair;
List of replacement parts;
Scheme and description of the presence / absence of defects on the car that do not require elimination during the repair process;
Completeness of the car: things, tools, accessories not related to repair.

Video (click to play).

Upon completion of the work, it is necessary to verify all the points on the documented repair and actually completed. One employee can take the car, the second one can repair the Citroen C4, and the third one can hand over the work. If any discrepancies are found later, it will be more difficult to prove it.