Known faults for the Audi A8 (D3 / D4 / D5).

Engine / equipment

2.7 and 3.0 TDI V6 (EA896 and EA897): Audi A4, A5, A6, A7, A8, Q5, Q7; VW Touareg, Phaeton and Amarok; Porsche Cayenne, Macan and Panamera

Period mentioned

2004–2018

Symptoms

Chain rattle for the first seconds after a cold start; power loss or limp mode from the intake flaps; coolant or oil loss in the engine V; EGR faults with rough idle.

Possible cause described

The timing chains sit at the rear of the engine, against the bulkhead, and their tensioners lose pressure. The intake flaps use plastic linkage rods that wear. The coolant valve, oil cooler gasket and EGR are packed into the engine V and leak with age.

Check for the garage

Listen to a cold start (a rattle lasting more than 2–3 seconds is a bad sign), check flap operation with a diagnostic tool, look for leaks in the engine V and check the oil change history.

Cost cited in the source

Tensioners and chains: approx. €2,000–4,500; EGR with cooler: €1,000–1,500; oil cooler gasket: €300–600A rough figure from the original database, not an up-to-date quote.

Mileage cited in the database: 100,000–150,000 km. This is not a maintenance interval and does not predict a failure.

Sources from the original database

Engine / equipment

Air conditioning with clutchless compressor and N280 regulating valve (combustion VW, Audi, Seat, Cupra and Skoda from 2006)

Period mentioned

2006–2026

Symptoms

The air does not cool or cools intermittently (for example only at motorway speed), and sometimes the compressor rattles with the A/C on. Codes 01232 (N280 valve), P2612 or 00898.

Possible cause described

The compressor regulates its output with the N280 solenoid valve, its most common failure point. Audi issued technical bulletins over a manufacturing fault in this valve on Sanden compressors. Its connector can also become brittle and corrode (especially without the engine undertray), or the wiring fails.

Check for the garage

Read the codes and N280 control current with VCDS or ODIS, measure its resistance (about 10 ohms) and check the connector and wiring before replacing parts. If the valve or compressor is replaced, the whole circuit must be flushed.

Cost cited in the source

N280 valve: a cheap part (about 30 dollars) where sold separately; new compressor with circuit flush: considerably moreA rough figure from the original database, not an up-to-date quote.

Sources from the original database

Engine / equipment

MQB and MLB plug-in hybrids: Golf GTE/eHybrid, Passat GTE, Tiguan and Arteon eHybrid, Multivan T7, Audi TFSI e, Seat and Cupra e-Hybrid, Skoda iV

Period mentioned

2019–2023

Symptoms

Usually none. In rare cases, overheating or fire in the engine bay or battery.

Possible cause described

In 2022 the VW Group recalled about 118,000 plug-in hybrids over a high-voltage system fuse that could fail under overvoltage and insufficient insulation; an extra insulating mat is fitted. In 2024 Audi added a recall for 2022–2023 Q5 and A7 plug-in hybrids over battery faults.

Check for the garage

Confirm by VIN at the dealer that the high-voltage system recalls have been done.

Cost cited in the source

Free under the recallsA rough figure from the original database, not an up-to-date quote.

Sources from the original database

Engine / equipment

4.0 TFSI V8 twin-turbo (S6, S7, RS6 and RS7 C7, S8 D4)

Period mentioned

2012–2018

Symptoms

Hard starting, damaged turbo (smoke, power loss), oil consumption and misfires.

Possible cause described

The mesh strainer in the turbo oil feed, inside the engine's V, can clog and starve the turbos of oil. Audi issued a bulletin (2018, revised in 2021) with an optimised strainer and a check valve. Early engines also consume oil.

Check for the garage

Confirm whether the turbo oil strainer bulletin was applied, measure oil pressure and run an oil consumption test.

Cost cited in the source

Turbos: several thousand eurosA rough figure from the original database, not an up-to-date quote.

Sources from the original database