Audi A6
V6 biturbo diesel with 230 kW. Twin-turbocharged six-cylinder for maximum pulling power. Complex design leads to higher maintenance costs.
BiTurbo diesel with V8 punch
313 hp BiTurbo TDI with brutal torque. In a class of its own on the motorway.
Engine Weaknesses 6
The inner lining of the air-gap-insulated exhaust manifold detaches over time. Metal particles enter the turbine wheel of the small high-pressure turbocharger and destroy it. Both parts must be replaced.
Symptoms: Loud whistling or metallic rattling from the turbo, significant power loss especially below 2,000 rpm, delayed boost pressure buildup
Like all EA897 third-generation engines, CGQB units are susceptible to camshaft breaks from material defects. Mainly affects vehicles from production period 2014–2017.
Symptoms: Loud, unusual knocking or ticking from the engine bay; sound differs from normal diesel combustion noise
The EA111 1.2 TFSI (CGQB) suffers from severe timing chain problems from as early as 30,000–40,000 km. Defective tensioners and worn guide rails lead to chain jump and total engine loss.
Symptoms: Clattering rattle on cold start, engine warning light, in worst case sudden engine shutdown.
On the 1.2 TFSI EA111 (CGQB), turbochargers fail from oil coking in the supply line and inadequate bearing lubrication. Whistling and blue smoke are typical symptoms.
Symptoms: Whistling or squeaking noise under load, blue smoke from the exhaust, significant power loss.
With the 8-speed automatic in combination with the bi-turbo, drivers report slipping during gear changes under load and delayed torque lockup. Often a gearbox oil quality issue or TCU fault.
Symptoms: Rev rise without corresponding acceleration during shifts, delayed torque transfer especially on kickdown
The 3.0 TDI tends to leaks at the upper oil pan and various seals at higher mileages. Full disassembly required to seal properly.
Symptoms: Oil spots under the vehicle, oil smell after parking, dropping oil level between service intervals
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.