Audi A7

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 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.