checkdenwagen.de is an independent provider of on-site used-car inspections operating across Germany, based in Berlin with a network of inspectors throughout the country. The Audi A4 has been one of Germany's best-selling mid-size cars for almost three decades — correspondingly present and widely available on the used market. Yet behind the even bodywork and the premium promise lie fundamentally different risk patterns depending on the series and engine. The B6 and B7 generations (2000-2008) brought the 1.8T with timing-chain and oil-sludge issues as well as the first versions of the 2.0 TFSI. The engine with the oil-sludge risk — above all with long service intervals and the wrong oil grade — is today a classic among A4 buyers' worries. The Multitronic CVT gearbox of this era is regarded as critical: slipping and loss of pulling power at high mileage are well documented. The B8 generation (2008-2015) relied on the 2.0 TFSI of the second EA888 generation — and this engine is the A4 topic par excellence. Worn piston rings lead to measurable oil consumption; a failing timing-chain tensioner rattles on a cold start and, if ignored, can result in engine damage. On front-wheel-drive variants the Multitronic is still fitted and still risky. The common-rail TDI unit brings its own timing-chain and EGR issues. The B9 generation (2015-2023) benefits from the third EA888 generation with significantly improved oil-consumption behaviour and from the new 2.0 TDI (EA288). The S tronic DL382 is considered more robust than the old Multitronic variants, but has its own inspection profile. Our inspector spends around 1.5 hours on site, works through a checklist of over 100 points and delivers you a digital photo report — as a clear basis for your purchase decision or price negotiation. Four things set us apart from a quick test drive: we are independent of seller pressure. We measure with our own equipment. We read out all control units. And we know the typical A4 weak points by series and engine generation.
Get your used Audi A4 inspected: on-site used-car inspection, from €289
The Audi A4 sounds like premium mid-size motoring without compromise — but certain model years and engine variants carry risks that never appear in the listing. On the B8 with the 2.0 TFSI of the second EA888 generation, increased oil consumption due to worn piston rings is demonstrable and widespread. The same engine can rattle on a cold start when the timing-chain tensioner gives way — a fault that, if undetected, leads to engine failure. The Multitronic continuously variable transmission (B6, B7 and front-wheel-drive B8) loses its pulling power at high mileage. Our inspector knows every A4 generation, comes directly to the vehicle and delivers you a digital photo report based on over 100 checkpoints within 24 hours. Fixed price from €289 incl. VAT and travel.
Audi A4: character, generations and buying risks at a glance
Premium mid-size car with specific generational risks
The Audi A4 stands for build quality and a strong brand image — both of which can also mask weaknesses in the listing. Every generation carries its own risk profile: B6/B7 with oil sludge and the Multitronic, B8 with EA888 oil consumption and the timing-chain tensioner, B9 with more solid units but still electronics and suspension condition worth checking.
B8 2.0 TFSI: the A4 topic par excellence
The second-generation EA888 (fitted in the B8, model years roughly 2008-2012) consumes oil in cases of wear through piston rings that have become porous. At the same time the timing-chain tensioner can rattle on a cold start — both characteristics that don't appear in the listing, but are measurable and audible in an independent check.
Multitronic: buy with caution, inspect with rigour
The continuously variable Multitronic CVT gearbox (fitted in the B6, B7 and front-wheel-drive B8) is regarded as one of the weak points of the A4 line-up. Slipping, loss of pulling power and hydraulic problems at high mileage end in an expensive repair. Our inspector tests the response under load and reads out the gearbox control unit for relevant codes.
Over 100 checkpoints, OBD, paint thickness — directly on site
Visual and acoustic inspection, digital paint-thickness measurement on all exterior panels, OBD read-out of all control units (engine, gearbox, ABS, airbag, MMI, driver assistance) and a test drive with targeted drivetrain and gearbox load — all in around 1.5 hours. You don't need to be there.
Audi A4 generations: B6, B7, B8 and B9 compared
The four A4 generations relevant to used-car buyers differ considerably in engine range and risk profile: B6 (2000-2004): The first A4 with the 2.0 four-cylinder naturally aspirated engine (130 hp) and the 1.8T (163 hp). The 1.8T of this generation is prone to oil-sludge formation with long change intervals or the wrong oil grade — damage that clogs oil passages and harms the camshaft bearings. The Multitronic CVT (automatic, front-wheel drive) begins in this generation. Today usually high-mileage, offered cheaply, but with a correspondingly elevated repair risk. B7 (2004-2008): Technically close to the B6, visually revised. Still the 1.8T and 2.0 TFSI (first generation), the first 3.2 FSI V6. The 2.0 TFSI of this generation (BWT, BUL, BPG) does not yet have the piston-ring issue of the second EA888 generation, but brings its own thermal-management topics. The Multitronic CVT remains widespread in front-wheel-drive variants and carries the same risk profile. B8 (2008-2015): The most critical generation for used-car buyers. The 2.0 TFSI of the second EA888 generation (CDNB, CDNC, CAEB) shows clear oil consumption through porous piston rings on high-mileage or poorly maintained examples. The timing-chain tensioner of the same engine family tends to rattle on a cold start. TDI variants (2.0 CR TDI) have their own timing-chain and EGR topics. The 2011 facelift brought the EA888 Gen 3 for some variants — considerably more relaxed in that case. quattro variants with a conventional Torsen differential are more robust than Haldex variants. B9 (2015-2023): Technically the cleanest level. The third- and fourth-generation EA888 with greatly improved oil-consumption behaviour. The 2.0 TDI (EA288) as a reliable base. The S tronic DL382 as the standard automatic, more robust than the Multitronic. MMI Navigation plus with the virtual cockpit brings more electronic complexity. Focus during the check: accident history, OBD fault-memory analysis, suspension condition and a service-record cross-check.
Audi A4 weak points: what our check specifically examines
B8 2.0 TFSI (EA888 Gen 2): oil consumption through piston rings
The 2.0 TFSI of the second EA888 generation (fitted in the A4 B8, model years roughly 2008-2012, engine codes CDNB, CDNC, CAEB) consumes engine oil in cases of wear through porous or worn piston rings. Recognisable by regular topping-up of oil, an oily exhaust smell and relevant lambda fault codes. Audi recognised the problem and ran a goodwill campaign — but not every affected vehicle was treated and not every goodwill repair is cleanly documented in the service history. Our inspector checks the oil level and its colour, reads lambda and mixture values from the engine control unit and assesses the service history for indications of oil consumption.
B8 2.0 TFSI: timing-chain tensioner rattle on cold start
The same second-generation EA888 engine can show a characteristic rattle or clatter on a cold start — a sign of a worn timing-chain tensioner or one losing pressure. If the chain subsequently jumps, engine damage is guaranteed. The rattle often fades after a few seconds once oil pressure has built up — which reassures the layperson but does not remove the issue. Our inspector starts the engine cold after a defined cool-down period, listens systematically to the cold-start acoustics, reads the camshaft sensor for signal faults and assesses the oil-pressure build-up in the control-unit read-out.
B6/B7 1.8T: oil sludge and camshaft bearings
The 1.8T in the A4 B6 and B7 (AMB, AWM, BFB, BWT) is prone to oil-sludge formation when oil-change intervals are long or non-approved oil grades are used. This clogs oil-pressure passages and camshaft bearing points and leads to wear up to and including bearing damage. The problem is barely visible on the vehicle — but with the valve cover open or via endoscopy it can be documented well. Our inspector opens the oil filler cap and illuminates the visible engine bay, reads relevant engine faults and assesses the service history for the regularity of oil changes.
B6/B7/B8 Multitronic CVT: slipping and loss of pulling power
The continuously variable Multitronic transmission (CVT, fitted in the B6, B7 and front-wheel-drive B8) shows increasing slip at the variator belt and weakening control of the hydraulic system at high mileage. Recognisable by uneven acceleration, a noticeable loss of pulling power under load or by high revs climbing without corresponding acceleration. Repair costs are significant — a gearbox replacement or a full overhaul often exceeds the vehicle's value on older cars. Our inspector tests the response under load on the test drive, checks the gearbox oil for colour and particles and reads out the gearbox control unit. Rule of thumb: a Multitronic with over 150,000 km and no documentation of an oil change is an elevated risk.
B8/B9 2.0 TDI (common rail): timing chain and EGR clogging
The 2.0 TDI unit in common-rail form (CAHA, CAGA, CGLD in the B8; EA288 in the B9) has a hydraulically tensioned timing chain that stretches when oil-change intervals are long or the oil is too thin. On top of this comes a known EGR valve issue in short-distance use: the exhaust-gas recirculation valve clogs, which leads to a loss of power and increased soot in the intake tract. Our inspector reads out DPF counters and regeneration frequencies, checks the EGR system for signs of clogging and assesses the cold-start sound impression of the diesel unit for chain noise.
B8 quattro: Haldex clutch vs. Torsen differential
The A4 B8 quattro is, depending on the body version, equipped either with a conventional Torsen centre differential (saloon with longitudinally mounted engine) or a Haldex clutch (individual Avant quattro variants). The Torsen system is robust and low-maintenance; the Haldex clutch needs a regular oil change roughly every 40,000 km. A missing Haldex oil change leads to pump wear and, in extreme cases, all-wheel-drive failure. Our inspector identifies the all-wheel-drive type via vehicle identification, checks the service history for corresponding entries and tests the all-wheel-drive engagement on the test drive.
B8/B9: water pump and cooling system (plastic impeller)
Several TFSI engine variants in the A4 B8 and B9 use water pumps with a plastic impeller — a lightweight feature that can break at high mileage or under sustained thermal load. A broken impeller means a failure of coolant circulation and rapid heat build-up. Symptoms: rising engine temperature, coolant warning lamp, sometimes a change in noise. Our inspector checks the coolant for an oil film and cloudiness, assesses the level and colour and monitors the engine's temperature behaviour after the warm-up phase.
All generations: multi-link axles front and rear
The Audi A4 (the B8 and B9 in particular) is fitted all round with multi-link axles that enable precise handling but make worn bushings and joints hard to spot. Creaking or knocking over cobblestones, restless straight-line tracking or increased steering play point to wishbone-bushing or joint wear. Our inspector examines the suspension on the lift, tests all pivot points with a shake test and assesses the steering behaviour and straight-line stability on the test drive.
All generations: OBD fault memory — including cleared codes
Freshly cleared fault codes are a common preparation tactic before a private sale. Cleared codes leave traces in the control unit: the inspector can see that the memory was recently reset and assesses this as a warning sign. Our inspector reads out all accessible control units (engine, gearbox, ABS, airbag, MMI, driver assistance, electric parking brake) and documents active and cleared codes in the photo report.
All generations: paint thickness and accident history
A reconditioned A4 is often visually indistinguishable from an accident-free one. Our inspector uses a digital ultrasonic paint-thickness gauge that shows to the millimetre whether a panel has been repainted or filler is masking accident damage. The readings are presented as a heatmap in the report — you can see exactly where the paint thickness deviates from the factory reference value. This applies to all exterior panels: doors, wings, bonnet, roof, tailgate.
Which Audi A4 engine is recommended — and which should you avoid?
The choice of engine on a used Audi A4 is the most important buying decision. Not every engine code carries the same risk. Recommended: The third-generation EA888 (fitted from the A4 B8 facelift around 2012 and throughout the B9, codes CVNA, CYRB, DEJA and others) is considered far more mature than its predecessor — oil consumption from the piston-ring issue is barely a concern here with proper maintenance. The 2.0 TDI in EA288 form (B9, codes DETA, DEUA, DFGA) is a solid diesel unit with no known design weaknesses. For both, the same applies: a complete service history with documented oil changes is essential. Buy with caution: The 2.0 TFSI of the second EA888 generation (A4 B8, codes CDNB, CDNC, CAEB, model years roughly 2008-2011) is the high-risk unit — oil consumption and the timing-chain tensioner, without a clean inspection finding, should be grounds for negotiation or for walking away. The 1.8T in the B6 and early B7 (AMB, AWM, BFB) carries the oil-sludge risk where the maintenance history is poor. Avoid: The Multitronic CVT gearbox (combined with any of the petrol engines above in front-wheel drive) at high mileage and without a documented oil change is a risk factor in its own right — regardless of which engine is fitted up front. You'll find the engine code in the vehicle documents (registration certificate Part I, field P.5) or via an OBD read-out directly on the car. Our inspector identifies the engine generation before the inspection begins and tailors the inspection checklist accordingly.
What does a used Audi A4 cost — and what is it really worth?
The price level of a used Audi A4 varies widely — depending on generation, engine variant, equipment line, mileage, gearbox type and proven vehicle condition. A B8 with an early EA888 engine and no proof regarding oil consumption is offered cheaply — and, after the necessary repairs, can cost considerably more than a well-maintained example with a higher asking price. Generally speaking: the A4 benefits from a stable brand image that keeps prices looking attractive even on mechanically problematic examples. Cars with a Multitronic gearbox in particular are often offered cheaply at higher mileage — because the seller knows the risk, or the vehicle is already showing symptoms he doesn't mention. A B9 as a low-mileage nearly-new car in well-kept condition with a complete service history justifies a noticeably higher purchase price than a B8 with a critical engine code and no proof of findings. The Premium package at checkdenwagen.de includes a market-price analysis that gives you a realistic estimate of the vehicle's value — as a basis for your price negotiation.
How your Audi A4 check works — in three steps
Book online in five minutes
Enter the vehicle's postcode and the listing link. The travel cost is shown to you immediately and transparently — no phone call, no form chaos. You can see straight away whether Standard or Premium is the better choice for your A4.
The inspector drives directly to the Audi A4
An experienced vehicle appraiser from our nationwide network coordinates the appointment directly with the seller. He inspects for around 1.5 hours on site: cold-start acoustics (timing-chain tensioner, oil-pressure build-up), OBD read-out of all control units, paint-thickness measurement on all exterior panels, suspension check on the lift and a test drive with targeted gearbox and drivetrain load. You don't need to be there.
Digital photo report within 24 hours
You receive the complete inspection report by email: all findings documented photographically, OBD codes explained, paint thicknesses as a heatmap, an assessment of engine, gearbox, suspension and bodywork by category. Clearly structured, free of jargon — ready to use directly in your purchase decision or price negotiation.
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Frequently asked questions about the Audi A4 used-car inspection
The Audi A4 check starts at €289 for the Standard package and €339 for the Premium package — each incl. VAT. Travel is included in the fixed price — no hidden costs. No hourly rate, no hidden costs.
Buy your Audi A4 on facts, not gut feeling.
A B8 with EA888 oil consumption, a timing-chain tensioner rattling its warning, or a Multitronic on the verge of slipping can quickly cost more than any price negotiation will ever save you. Our Audi A4 check gives you the facts — within 24 hours, from €289 incl. VAT and travel.