Used Audi A7 (C7): Durable Suspension, Expensive Transmissions, and Cylinder Scoring

In the first part of the material, we found out that the first-generation Audi A7 does not cause much trouble – problems with aluminum parts are easy to spot, and surprises with the mechatronic internals are inevitable in any technically complex car. Now let’s figure out how things stand with the powertrain and chassis, because the most interesting part of Audis from those years may be hidden right inside.​

Chassis

Brake system

The brake system on the A7 is good: even budget versions got front discs measuring 320×30 mm, and when choosing wheels larger than the standard 17 inches – 345×30 mm. Cars with 3.0 TFSI engines and the S7 version received composite discs measuring 356×34 mm, and RS 7 models were additionally offered carbon-ceramic discs measuring 400×34 mm and 6-piston Brembo calipers instead of the stock single-piston TRW or dual-piston ATE with floating brackets.

In general, few people complain about the A7’s brakes – you could say everything is made with a safety margin. On the rear axle, the discs are smaller: from non-ventilated 300×12 mm to 356×22 mm in the case of cast-iron discs and 370×30 mm – ceramic. The caliper on the rear axle is always single-piston with a floating bracket and a parking brake actuator. By the way, there are few complaints about the “handbrake” – the electric actuators have become cheaper, and many budget alternatives have appeared.

There are no particular issues with the ABS – sensors occasionally fail, sometimes there are complaints about damage to the magnetic disc in the hub, but more often the cause is a worn-out bearing. That’s not surprising, since very low-profile tires are used on the standard 19-21 inch wheels, and many owners even manage to install larger diameter wheels with increased offset. But you do need to keep an eye on the brake lines – on some cars they swell from deep corrosion.

Suspension

The suspension on the MLB platform differs little from Audi models of the mid-nineties – it is just as reliable and quite convenient to maintain. The control arms are different, the spindle is aluminum, but the upper pinch bolt still seizes up. For MLB-Evo, bolt WHT006542 with a thinner central section was offered instead of the stock N10770901 – with it, this kind of problem is practically eliminated. The new bolt was even installed on A7s from the last years of production, but most owners will have to purchase it themselves.

On early cars up to 2012, a not very successful straight arm and plastic stabilizer bar links were used, but in most cases these elements have already been replaced under warranty. Only the ball joint of the straight arm is replaceable, being the most loaded one, while on the other arms only the bushings are replaced as standard. The overall service life of this type of front suspension with careful handling exceeds 200,000 km, however, the A7 has many trims with extreme tire sizes, so the load on the suspension here is much higher than on the A6 model.

The service life of hub bearings is not very long: rear bearing failure after just 50,000 km is by no means rare, and the front ones are only slightly more reliable. The price of parts is relatively high: the original costs 15-56 thousand rubles, with the more affordable version, for 15 thousand, offering a reinforced bearing with increased rolling resistance, which is installed on cars with the rough-road package. The cost of non-original parts starts from 2,700 rubles, but on average a part will cost 5-10 thousand.

The rear suspension on MLB is quite durable, with almost all bushings being replaceable. Only the inexpensive front diagonal link is replaced as a whole, but even for it, aftermarket bushings can be found if desired. The service life of the outer bushings of the trailing arm is usually at least 120,000 km, and prices range around 5,000 rubles for the original and 1,500-2,000 rubles – for equivalents. Even the installation of hydraulic-filled elements from the A8 sedan is practiced – especially among those who use very low-profile tires. Of course, such experiments remain the domain of extremely advanced owners.

Air springs are most often found as elastic elements in the A7. The air suspension design is quite successful – only on the oldest cars do problems begin with leaks, fitting corrosion, hose cracks, level sensor failures, and pump wear. But you definitely shouldn’t be afraid of this, since the cost of repairing one strut has dropped to 15-30 thousand rubles. Quite inexpensive piston group kits can be purchased for the compressors. And the valve block doesn’t cause any particular problems, and finding a used one is easy – and inexpensive.

Steering

The steering rack with electric power steering on the A7 is quite reliable. It exists in two versions – regular and “active,” with variable gear ratio. The main problems with the rack are water ingress when bushings and boots wear out, as well as damage to the wiring connector. If you don’t ford water obstacles half a wheel deep and regularly check the boots, the risk is not too high. Those who neglect preventive maintenance will one day have to shell out about 150 thousand rubles for a new rack, original or equivalent.

If there is no severe corrosion damage, the repair cost will be noticeably lower – replacing the motor and control board will cost less than 50 thousand rubles. The service life of tie rods and tie rod ends can be frustratingly short, but, as with the suspension, everything depends on the wheel size. Wide wheels plus low-profile tires – heavy load and lots of vibrations that stress the rack and rods. Don’t be surprised if on cars with 21-inch wheels, mechanics will condemn the tie rod ends every second service. After all, it’s enough to simply drive on uneven asphalt and frequently turn the steering wheel in place.

Transmission

Common problems

No serious problems with the driveshafts on the A7 have been noted. The splines and CV joints serve reliably, the joints fail when the boots are damaged, and there are simply very few cars with mileages over 300,000 km. There is a problematic element only on all-wheel-drive cars – the propeller shaft has a CV joint whose boot literally falls apart every few years due to the unfortunate placement of the exhaust system. If you don’t want to look for a replacement CV joint from a Moskvich-2141, keep an eye on the condition of the boot.

Gearboxes

The A7 has quite a few gearboxes. Front-wheel-drive cars were equipped with either the good old VL381 CVT or the 7-speed preselective DL382, which began to be used after the facelift. All-wheel-drive cars were equipped with the 7-speed preselective DL501, which was installed on almost all modifications. The most powerful versions got an 8-speed ZF automatic – a modification of the 8HP55A gearbox, although cars from the USA were equipped with this hydromechanical unit in tandem with the naturally aspirated 2.8 FSI engine before the facelift.

We have already written in quite some detail (https://www.kolesa.ru/article/audi-a6-c7-s-probegom-polnyy-privod-slomat-trudno-a-pochti-vse-motory-slomayutsya-sami) about these gearboxes, so this time we’ll limit ourselves to a general summary. The VL381 CVT is a simple and reliable choice if front-wheel drive is enough for you and you drive calmly. The gearbox is very stable and durable if it isn’t overheated. Typical failures – mainly the failure of the speed sensor, which will require re-soldering the control board, or the jamming of the launch pack and scoring of the cones after towing, which is contraindicated for this car. There is no “neutral” here, and the launch pack, which disengages the transmission, is not lubricated when the engine is off and overheats after just a few hundred meters of movement.

With infrequent oil changes, the gearbox starts to make noise from the bearings and overheat due to a clogged heat exchanger. The disadvantages include a fairly high price on the secondary market – you won’t find a gearbox cheaper than 120 thousand rubles, although CVTs of the previous generation cost about half as much. But the most obvious drawback of the CVT is not the service life at all: the unit really dislikes an aggressive driving style, resists sharp launches, whines and vibrates when trying to use the full power of the engine.

DSG gearboxes of the DL501 series impress not so much with the shift speed and the ability to handle enormous torque, but with the repair cost. And this is despite the fact that the gearbox is already quite old and well known to specialists.

Yes, it is quite reliable, but every hundred to hundred-fifty thousand kilometers it requires serious maintenance – with inspection of both the mechanical part and the mechatronics. The list of what needs to be checked is quite extensive – from fork tips to solenoids and wiring. Moreover, both the friction pack and the dual-mass flywheel are very expensive. If you just want to replace the clutch pack assembly with the housing, prepare at least 60 thousand rubles. Fortunately for budget-conscious owners and auto repair shops, the clutch assembly can be rebuilt, and as a rule, it can be repaired very affordably – the price of a friction disc kit is within 10-15 thousand rubles, and together with the gasket, seals, and labor, there’s a chance to fit into 35 thousand.

The price of a dual-mass flywheel in original form will be about 300 thousand rubles. LuK costs from 87 thousand, and there are simply no cheaper options. The flywheel can be repaired for a small fraction of that amount – for those who like to launch “flat out” from a standstill, it fails in about 50,000 km, while with normal operation it lasts 150-200 thousand km.

Front-wheel-drive cars with the DL382 gearbox are not particularly inferior in automatic transmission costs to all-wheel-drive cars with the DL501, because the price of the flywheel and clutch kit is only slightly lower – the clutch costs from 71 thousand rubles, the flywheel – from 58-66 thousand depending on the engine. The clutch more often has to be replaced as an assembly due to the nature of wear. The gearbox has a more delicate mechanical part – an unbalanced flywheel very quickly destroys the input shaft bearings, and the mechatronics is noticeably more capricious, having problems with both the pump power supply and pressure.

Operation is complicated by the presence of many versions of components, since the gearbox was updated several times over the years of A7 production. Moreover, if the oil in the hydraulic part has never been changed at mileages over 200 thousand kilometers, the chances of mechatronics failure increase significantly.

Is the 8-speed ZF automatic more reliable than the DSG and CVT? This gearbox mainly works with the most powerful engines, so – no. With top gasoline and diesel engines, the service life of the hydromechanical unit is not long – already at mileages of 150-200 thousand km, repairs become commonplace. Moreover – very expensive ones.

You can find used 8HP55A gearboxes, which until recently cost literally a couple of tens of thousands of rubles. Now their price has increased tenfold, but it’s still cheaper than a full repair in most cases. And some craftsmen rebuild automatics using “donor” 8HP gearboxes from other brands, which allows fitting a serious restoration into about a hundred thousand rubles. In general, choosing the most powerful A7 variants for the sake of a “real automatic” is not worth it, and looking for an old 2.8-liter engine – even more so.

All-wheel drive

Audi’s permanent Quattro all-wheel drive causes no particular trouble; it’s enough to change the oil in the rear differential every hundred thousand kilometers and monitor the condition of the propeller shaft and rear axle.

Engines

Common problems

V6 and V8 engines with alusil cylinder blocks are very risky options. Moreover, the density of the component layout is very high, so any repairs are expensive. Otherwise, everything is like other modern cars with high-temperature engines and an abundance of fitting connections: many seals and cooling system components gradually fail, requiring increased attention on cars over five years old.

Another surprise is reserved in the expansion tank of almost all versions. There is a silicone filler inside that over time spreads throughout the cooling system, clogging radiators, heat exchangers, and even cooling jackets on diesels. Therefore, it’s better to proactively replace the tank with a silicone-free one.

Gasoline engines

We have already written about these engines repeatedly. Pre-facelift cars were mainly equipped with EA837 Gen3 engines of the CGWB, CGXB, CGWD, CHMA, CTUA, and CTTA series – these are 3.0 TFSI supercharged engines with an alusil block. In addition to these engines, naturally aspirated EA837 Gen2 engines in the 2.8-liter version of the CHVA, CNYA, and CLXB series are also found. These are slightly older FSI engines with different injection equipment, which can “delight” with hydro-locking, and scoring is noticeably more common in them.

After the facelift, the EA837 Gen3 engines were replaced with newer EA837 Gen3 Evo engines of the CREC and CREH series. These are still supercharged engines with 333 horsepower, but they already have dual injection MPI+FSI, as well as cast-iron liners. And there’s also a phase adjuster on the exhaust camshaft, which the supercharged engines of the previous generation didn’t have. Of the serious problems, only the “dusting” catalytic converters remain, which very poorly tolerate tuning and misfires, and “popcorn” tunes simply kill them. The timing drive has a decent service life – sometimes over 250,000 km, but it’s better to plan for replacement around 150,000 km.

The naturally aspirated engine became known as CVPA, but in fact it’s still the same Gen2 with alusil and scoring, except that the new fuel equipment doesn’t lead to hydro-locking during cold starts.

On post-facelift cars, inline “fours” of the EA888 Gen3 and Gen3b series appeared – in the 1.8 version it’s the CYGA engine with 190 horsepower, and in the 2.0 version there are several at once – CYPA, CYNB, and CYPB, which can have 249 horsepower in the case of CYNB and CYPB, as well as 252 horsepower for CYPA. These are very good units, of which only the not-so-long timing drive service life and the tendency for crankshaft and camshaft scoring when operating on standard low-viscosity oil with the first stage of the oil pump not disabled remain from all the EA888 problems.

The 4.0 TFSI engines with 420 and 450 horsepower on the pre-facelift S7 are called CEUC, on the facelift – CTGE. Alusil engines with turbos in the V of the block have good tuning potential, but, as with alusil engines, it’s worth remembering the risk of scoring. For the RS 7, the 560-horsepower engine modifications were called CRDB and CWUB, and the rare 605-horsepower engine received the index CWUC. The differences between the engines were mainly in the turbos and auxiliary equipment, but there is no global difference between them – including in terms of reliability.

In general, these are very technologically advanced units – the timing drive is reliable, leaks are rare, the injection is also decent, but the valves are still prone to fouling. Scoring is not the biggest problem of this line, because during tuning the piston system fails either in the case of air leaks or failure of one of the sensors, or in the case of high-pressure fuel pump wear. Moreover, the engine’s design scheme literally within three to four years leads to the replacement of the cylinder head gasket, most of the plastic near the V of the block, and sometimes even the valve stem seals. In addition, the steel oil supply lines also coke up from the inside, and the catalytic converters burn out.

The more or less practical and reliable options are the “fours” or the facelift 3.0 TFSI with 333 horsepower. The other engines can’t boast this. And if the risks regarding the 4.0 TFSI are rewarded with excellent dynamics even in stock form and fantastic tuning potential up to 1000+ horsepower, then the rather dull 2.5 and 2.8 FSI are simply slightly simpler and cheaper to repair than all the supercharged ones. But their cylinders get scored almost more often – due to the higher operating temperature.

The EA837 Gen3 and EA824 Gen3 TSI lines are an example of how the reliability situation of a new design began to improve, but never reached the finishing touch in the form of the EA837 Gen3 Evo and EA825. The timing drive system and centralized auxiliary drive were simplified as much as possible, removing the problematic power steering drives, the alternator began to be driven strictly by a belt, and the engine layout was extremely optimized – this is especially noticeable in the supercharged versions of this generation’s engines.

Cooling was sorted out, though with the complication of a switchable pump. The timing drive began to last over 150 thousand kilometers – almost as reliably as on diesels. Injection no longer had particular problems, overheating was managed, and the most powerful versions’ piston systems received pistons with a special coating – though they weren’t coated with atomic iron like the Mercedes M119/M120 units.

They never abandoned alusil, so the risk of scoring hung like a sword of Damocles, and the price of parts for a full overhaul still causes depression, even if you use used pistons and a re-lined block. By the way, the quality of block restoration in decent shops is quite high, and the average price of re-lining a V6 is about 40 thousand rubles. In the case of the 3.0 TFSI, you can install a cylinder block from the CREC and get a quite factory solution – though, it’s cheaper to simply swap in a used engine from a facelift car.

Diesel engines

The 3.0-liter diesel engines belong to the EA897 family, starting with the CLAA with 204 horsepower and ending with the twin-turbo CGQB with 313 horsepower and the CVUA with 320 horsepower. Pre-facelift cars were fitted with CLAB, CDUC, CKVB, CDUD, CKVC, and CPNB engines with power ranging from 220 to 286 horsepower. The facelift brought CDUD, CVUA, CTBC, CTCC, CVUB, and CPNB engines, which belong to the same family, while the latest CZVC, CZVA, and CZVE series belong to the EA897 Evo line and differ in the oil pump drive from the front edge of the crankshaft.

All engines are complex, prone to leaks at high mileages, and the timing drive lasts only slightly longer than on gasoline engines – the average service life is 200-250 thousand kilometers. True, it’s significantly simpler, consists of two chains, and is easier to replace. You can add to the list of minor annoyances the capricious piezo injectors on most engines and the rather finicky GTB2256VZ/VZK turbos. The Evo engines have a GTB2060 turbo, which is heavily overloaded and therefore has a rather limited service life. In general, the engines are far from ideal, but nevertheless they are dearly loved because against the background of gasoline engines they boast enviable reliability. Except perhaps for the twin-turbo models with their extremely complex intake system.

To take or not to take

Among the gasoline engines, there is an option that is decidedly better than the rest: the facelift 3.0 TFSI with cast-iron liners. The inline “fours” are also good, but extremely rare, and the diesel 3.0s are quite common, but they don’t combine well with the model’s sporty image.

The other options have a right to exist, but the high chances of a major overhaul spoil the mood, and the oil consumption of a “scored” engine can suddenly end with a punctured block, just by overloading the engine. Fuel is added to the fire by the transmission, which doesn’t really want to remain cheap to operate on all versions except the front-wheel-drive one with the CVT. In that case, the choice of engines narrows down to the extremely unpromising 2.8 FSI and the not very sporty diesel.

However, the car willingly reveals its potential if you’re not inclined to skimp on maintenance. There’s the decent 4.0 TFSI, and its combination with two fast automatics to choose from, with the DL501 handling hard acceleration and even drifting quite well. But let’s be honest – in one’s right mind, it’s hard to choose an A7 over a “regular” A6 of the same generation.