Audi A7

The CZVC 3.0 TDI 272 hp (SQ5, A6, A7) is more severely affected by the camshaft material defect than the 218 hp variant. Audi TPI 2043172 lists CRT-type codes with high unit counts. Affected engines serial numbers 000001–175973. Fracture directly causes engine damage.

Symptoms: Knocking, abnormal noises on cold or warm start, rattling from the valvetrain, sudden power loss

Timing chain elongation on the CZVC V6 occurs particularly when oil maintenance is neglected. The four-chain-plus-belt system for the high-pressure pump requires regular oil changes. Repair costs can exceed €3,000 as 15–20 labour hours are needed.

Symptoms: Rattling on start, camshaft fault codes in ECU, rough running, valve timing alarm

On the 3.0 TDI CZVC a defective high-pressure pump can introduce metal debris into the entire fuel system and damage the injectors. Repair includes pump, rail, high-pressure lines, and all injectors. Audi goodwill was granted in some cases but is not guaranteed.

Symptoms: Starting problems, metallic noises, fuel pressure fault codes, rough running, severe power loss

Design or material defect in camshafts of certain EA897 production batches leads to premature fracture. Affected CZV engines (218 hp) show similar symptoms to the 272 hp variant.

Symptoms: Hammering/ticking engine noises clearly distinguishable from normal diesel clatter

The 3.0 TDI CZVC SQ5 uses a variable geometry turbocharger. At high mileage or with inadequate lubrication, turbo bearings and VGT vanes wear. Damage from upstream system faults (DPF back-pressure, oil contamination) is more common than primary failures.

Symptoms: Whistling or hissing noise, power loss under high load, oil mist from intake tract, fault code P0299

The 3.0 TDI EA897 uses four timing chains. Tensioners lose oil pressure at standstill; the chain sags and rattles on start. Long-term wear causes chain failure.

Symptoms: Timing chain rattle on cold start, disappears after a few seconds, worsens over time

A7 4K models 2020–2021: nuts on rear axle control arms do not meet specification. If they fracture, the rear axle can break away uncontrollably.

53,449 vehicles A6/A7/Q5 produced 2019–2024: cell modules in the 48V battery can overheat during charging and cause a fire risk.

On the optional adaptive suspension, servo actuators inside the dampers can fail due to moisture ingress. The damper must be replaced as a complete unit.