2007 Audi A8 Quattro Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2007 Audi A8 Quattro

2007 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.

Various Probelms Caused by Clogged Plenum Tray Drain

Clogged drains can allow rainwater to accumulate in the plenum tray (at the base of the windshield). The water may leak into the vehicle's interior, brake booster, or electrical components, which can lead to major problems. Our technicians recommend keeping the tray clear of leaves, pine needles, and other debris.

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. 

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2007 Audi A8 Quattro Questions

How do I troubleshoot my rear window defroster? (1 answer)

When I press the dashboard button for the rear defroster, the light comes on and, the outside mirror defrosters, which are also controlled by the same switch, begin to defrost. I have no indication the rear window defroster is working no matter how long I wait. I don't see a fuse specified in...

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2007 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.

Air Bag Warning Light and Passenger Side Air Bag Off Lights May Come On

The air bag warning light and passenger side air bag off notification light may illuminate due to low battery voltage. If this occurs, the passenger air bag will not deploy in an accident. Dealers will reprogram the air bag control module software. The Audi recall number is JR. This recall began on December 5, 2006.

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