Audi A6
EA888 Gen3B with improved piston design and strengthened timing chain over predecessors. Oil pump remains a structural weak point across the entire EA888 family. Significantly more reliable than Gen1/2 with correct oil change intervals and quality oil. Direct injection promotes intake valve carbon build-up at medium mileages.
252 hp in an executive estate — touring dynamics
In the heavier A6 C7 FL, the 252-hp four-cylinder is up against greater kerb weight — the result is pleasant dynamics without a sporting character. A refined tourer for long motorway stretches.
Engine Weaknesses 8
The Gen3B variable oil pump delivers insufficient oil pressure at low rpm. Camshaft phaser rattling and premature chain wear result. Particularly problematic in short-trip urban driving.
Symptoms: Rattling/knocking after cold start, oil pressure warning at idle, camshaft phaser fault codes
Recalls 27H2/27H8 (2020): moisture ingress into the belt starter-generator (48V MHEV system) causes short circuits and overheating with fire risk. ~530,000 vehicles worldwide (A4, A5, A6, A7, Q5, production years 2017–2020). Audi advised against garage parking until repair.
Symptoms: Sequential electrical fault messages, vehicle shuts down, in worst case smoke / fire
Early A4 B9 (2016–2017) with CYRB show cold-start rattling from chain tensioner oil pressure loss overnight. Oil pressure takes 2–3 seconds to build; tensioner does not tension the chain fast enough. Chain inspection recommended from ~100,000 km.
Symptoms: Brief rattling on cold start (2–5 sec), P0016/P0017 after extended standing, metallic clattering
On the CYRB (Gen3B) the water pump and thermostat are integrated in a combined plastic housing. The housing cracks from thermal cycling and causes coolant loss. Typically from 60,000–100,000 km.
Symptoms: Coolant loss without visible external leaks, overtemperature warning, coolant smell after engine shutdown
The turbocharger's electronic wastegate actuator absorbs moisture (cracks in the inverter plastic housing) and short-circuits. Leads to boost pressure control failure. Affects Gen3B turbos (also within recall-related context).
Symptoms: MIL with boost pressure fault, turbo noises, P0299, power loss
Gen3B CYRB uses only direct injection without port injection. The Miller cycle changes the gas exchange dynamics; EGR gases and PCV oil mist coke intake valves from ~50,000–80,000 km. Walnut blasting every 50,000 km recommended.
Symptoms: Power loss especially in the lower rpm range, rough cold start, P2015
The crankcase ventilation membrane valve tears. Gen3B has a revised PCV system but essentially the same design as Gen3. Under boost pressure an intake leak causes misfires.
Symptoms: Whistling noise, P2279, rough idle, power loss
The CYRB's piezo injectors can develop leaks or carbon deposits after high mileage (>150,000 km). Leads to misfires and uneven running. High-quality fuel and avoiding frequent short trips reduces the risk.
Symptoms: Misfires, rough running, increased fuel consumption, single-cylinder misfire fault codes
Vehicle Weaknesses 9
On model years 2015–2018, the locking bolt of the tow bar can fracture, potentially causing the trailer to become detached while driving. Free workshop visit required.
The Multitronic CVT gearbox has a notoriously poor reliability record. Improved on the C7, it remains a risk. Total failure possible from 100,000 km; repair is very costly.
A material defect can cause the camshafts in the 3.0 TDI to fracture, leading to engine damage. Mainly affects vehicles from model year 2014 to early 2017.
The optional air suspension (AAS) is prone to failure through porous air bellows and defective compressors. Repair costs of 600–1,800 EUR per corner are possible.
LED headlights fail due to defective control modules or individual LEDs. Repair is often more expensive than replacement, as modules cannot be replaced individually.
The automatic climate control shows malfunctions from around 60,000 km: incorrect temperature regulation, blower stage issues or complete failure of individual zones on the three-zone system.
Wheel bearings, particularly at the rear axle, show increased wear at higher mileages. Regularly flagged on vehicles from 80,000 km.
On the C7, rust occurs primarily on the underbody and sills, sometimes in hard-to-reach areas. On vehicles over 7 years old, the underbody should be thoroughly inspected.
On V6 and V8 engines, engine mounts often wear from around 50,000 km, causing noticeable vibrations.