Audi A7

Material defect on camshafts of EA897 engines (272 hp and 218 hp) built 2014 to early 2017. A broken camshaft causes total engine failure. Audi performed goodwill repairs where service history was complete.

Symptoms: Loud ticking or knocking from the engine bay clearly exceeding diesel combustion noise; often occurs on cold start or under load

The 3.0 TDI V6 uses four timing chains. From around 160,000 km cold-start rattling occurs. Timing chain replacement requires extensive engine removal and costs €1,500–4,500.

Symptoms: Cold-start rattle that disappears as the engine warms up; engine check light; rough running

The variable oil pump in the EA897evo reduces oil pressure at low rpm for Euro 6 optimisation. With fuel-diluted oil viscosity drops, which can lead to seizure damage.

Symptoms: Rising oil level (fuel in oil), oil pump clatter, abrupt engine damage possible without warning

Short trips prevent complete DPF regeneration. The filter clogs and the engine automatically reduces power. Frequent active regeneration promotes fuel ingress into the oil.

Symptoms: Power loss and increased fuel consumption, DPF warning light, oil level rises from fuel ingress

On the CRTE the coolant control valve and oil cooler can become leaky and cause gradual coolant loss. Left untreated, overheating damage is likely. The intake manifold can become contaminated with oil mist.

Symptoms: Dropping coolant level without visible leak, coolant smell in engine bay, temperature rising under high load

The optional air suspension on the A7 4G is prone to compressor failure and leaking air bellows. Leaking bellows cause the compressor to run continuously until it overheats.

3.0 TDI models produced March–Dec. 2012: oil can enter the brake servo via vacuum lines and damage its membrane.

The S-Tronic DL501 dual-clutch gearbox suffers from premature clutch wear in frequent stop-start traffic. Regular gearbox oil changes every 60,000 km are necessary.