2008 Audi A4 Quattro Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 2008 Audi A4 Quattro
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2008 Audi A4 Quattro ProblemsDecreased Power and Fuel Economy from Carbon Buildup
The 2006-2016 Audi A4 Quattro uses FSI and TFSI 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, since the A4 Quattro uses direct injection, gasoline does not flow through common carbon buildup areas.
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.
A turbocharged engine looses power if the turbocharging system has a leak (boost leak). The most common turbo boost leak for the A4 Quattro 2.0 FSI is a torn rubber diaphragm on the diverter valve, which is intended to open only if pressure gets too high. Common symptoms are increased turbo noise when letting off of the gas pedal, and power loss.
If there is a turbocharging system leak, the system will need to be inspected, and the defective seals and/or valve will require replacement.
The flywheel for the 2006-2008 Audi A4 Quattro with the 2.0 FSI Turbo engine is a non-conventional "Dual Mass" flywheel. It is known to make light rattling noise when the engine is cold, and should subside once the engine temperature raises. If the rattle doesn't go away when the engine warms, the flywheel may have failed.
If the dual mass flywheel has failed, the only solution is to replace the flywheel.
2008 Audi A4 Quattro Questionsaudi dealer is charging me $1,186 to replace fuel pump and injector. Fair price? (1 answer)
The mechanic says the valve cover is causing the leak, NOT the valve cover gasket. The cost will be $800, and I think this includes both the valve cover and the valve cover gasket. Does this seem right? Diagnosis says: "Valve cover is leaking oil. Breather system needs replacing with the...
S line model
2008 Audi A4 Quattro RecallsAir Bag Control Unit Fails
The air bag control unit may corrode and fail. Dealers will replace the air bag control unit free of charge to resolve the concern.