2009 Audi A8 Quattro Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2009 Audi A8 Quattro

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2009 Audi A8 Quattro Problems

Check Engine Light and/or Engine Overheating Due to Failed Thermostat

The thermostat may erratically stick open or closed. The can result in illumination of the Check Engine Light and/or engine overheating.

Decreased Power and Fuel Economy from Carbon Buildup

The 2007-2017 Audi A8 with FSI/TFSI, including the W12 are direct injection engines. These engines are subject to carbon buildup in the intake system which can cause power loss, OBD codes and a check engine light, and a rough idle. In normal engines, the engine is cleaned by the gasoline flowing through the injectors and into the intake system, however, the A8 uses direct injection so gasoline does not flow through common carbon buildup areas. 

Possible trouble codes include: P0300P0301P0302P0303P0304, P0305, P0306, P0307, P0308, P0309, P0310, P0311, P0312.

The solution is to remove the intake manifold and professionally clean the intake manifold, intake ports on the cylinder head, and the intake valves. This may need to be done in as few as 20,000 miles. 

Multi-Link Suspension Components May Wear Prematurely

Premature wear in various multi-link suspension components can cause noises that are difficult to diagnose. Worn suspension parts can also cause uneven tire wear and create steering alignment problems.

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2009 Audi A8 Quattro Questions

Does the timing chain really needs to be replaced? (1 answer)

The camshaft solenoid was replaced to fix check engine light with fault code P0024. Check engine light reappeared after a month with same fault code. I was advised that I now need to replace the timing chain, tensioners, and guides. According to the technician, the timing chain may have stretched...

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2009 Audi A8 Quattro Recalls

Sunroof Glass Is Not Secured To The Sunroof Frame

The sunroof glass may not be secured properly to the sunroof frame. Dealers will install additional adhesive between the sunroof glass and frame free of charge to resolve the concern.

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