Audi A6
Revised V6 diesel with 160 kW after facelift. Optimised emissions treatment with dual SCR dosing. Smooth-running and economical.
Smooth multi-cylinder — relaxed cruising
218 hp 3.0L with a smooth, refined character. Relaxed cruiser with no sporting ambitions. Factor in the known weak points.
Engine Weaknesses 5
The 3.0 TDI CZVA (218 hp) is affected by the known camshaft material defect. Audi TPI 2043172 covers CZV engine variants as well. Affected serial numbers are from early production (a few thousand engines). Camshaft fracture inevitably leads to total engine damage.
Symptoms: Ticking or knocking noises beyond normal TDI clatter, camshaft control faults, power loss
The V6 3.0 TDI CZVA uses a four-chain timing system plus a toothed belt for the high-pressure fuel pump. The belt must be changed every 120,000 km. Chain elongation occurs primarily when oil maintenance is neglected and requires a complex repair.
Symptoms: Rattling on cold start, camshaft phase faults, fuel system messages, power loss
The EGR system on the 3.0 TDI V6 CZVA is prone to coking from the high soot content in the exhaust gas. Sticking EGR valves reduce engine power and increase fuel consumption. Complete jamming can cause mechanical valve failure and additional costs.
Symptoms: Power loss, increased fuel consumption, poor take-off, rough idle, fault code P0401
Piezo injectors on the 3.0 TDI CZVA show signs of wear at high mileage. Individual injector failure is possible. High-pressure pump failure contaminating the fuel system can damage all injectors simultaneously at very high repair cost.
Symptoms: Rough idle, hesitation at certain rpm ranges, black exhaust smoke, single cylinder running irregularly
CZVA (1.0 TFSI) and CGQB (1.2 TFSI) accumulate carbon deposits on intake valves and in the intake tract as direct-injection engines, especially with short-trip driving.
Symptoms: Power loss, rough idle, increased fuel consumption, occasional misfires.
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.