Audi A6
Proven V6 diesel with 150 kW. Smooth-running six-cylinder with good pulling power. Timing chain instead of cam belt, therefore less maintenance-intensive in the valvetrain.
Worry engine — costly weakness looms
204 hp 3.0L with a known issue: timing chain rattling on cold start. The risk of expensive repairs overshadows any driving pleasure.
Engine Weaknesses 5
Chain tensioners lose oil pressure on cold start; chain slaps until pressure builds. If elongated, chain skip with engine damage is possible. Older production years with four chains are significantly more susceptible.
Symptoms: Metallic rattling or clattering from the engine bay directly after cold start, disappears within a few seconds
Material defect in camshafts of the CRT variant (272 hp) causes tooth flank wear before 100,000 km. Knocking engine noises, in worst case engine damage.
Symptoms: Ticking or knocking engine noises clearly beyond normal diesel clatter
Oil lines below the turbocharger develop leaks. Oil consumption rises gradually, blue smoke from the exhaust. Complex repair as the gearbox and turbocharger must be removed.
Symptoms: Blue smoke from exhaust, dropping oil level, power loss, whistling under load
DPF clogs with frequent short trips and cold starts. Incomplete regeneration leads to power loss and limp mode. Cleaning approx. €500–700, replacement up to €2,500.
Symptoms: Yellow particulate filter warning light, power loss, increased fuel consumption, heavy exhaust plume
EA897 engines were implicated in the emissions scandal. Mandatory software update alters EGR control. Vehicles without the update risk deregistration.
Symptoms: No driver-perceptible symptom, only threat of authority-mandated deregistration if update is missing
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.