Audi A4 Repair and Maintenance
A guide to problems, costs, maintenance and repair for your Audi A4
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Audi A4 ProblemsDecreased Power and Fuel Economy from Carbon Buildup
The 2006-2017 Audi A4 2.0FSI, 2.0TFSI, and 3.2FSI are subject to carbon buildup inside the engine causing power loss, check engine light, and a rough idle. In normal vehicles, the engine is cleaned by the gasoline flowing through, however, these cars use direct injection so gasoline is rerouted away from 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.
The Audi A4 2.0T FSI engine looses power if the turbocharging system has a leak. The most common turbo boost leak 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, power loss, and engine code P0234.
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 2.0L Turbo 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.
Audi A4 QuestionsEnging spudders and back fires at WOT. (1 answer)
My 98 has a big turbo kit and sometimes it spudders or hick ups when accelerating/shifting. It also pops/back fires when shifting under load. Why would it start this now? Never had these issues when first bought the car?
What could be the cause of the power loss,jerking and cutting on an AUDI A4
Doesn't matter how little I put it still stalls
Audi A4 RecallsSide Marker Lights Do Not Illuminate With Parking Lights Or Headlights On
The side marker lights may not illuminate when the headlights or parking lights are on. Dealers will upload revised software to the vehicle to correct the concern free of charge.
The passenger frontal air bag inflator may rupture on deployment, causing metal fragments to come through the air bag and injure occupants. Dealers will replace the passenger frontal air bag inflator free of charge to resolve the concern.
The air bag control unit may corrode and fail. Dealers will replace the air bag control unit free of charge to resolve the concern.