2009 Audi A4 Quattro Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2009 Audi A4 Quattro

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2009 Audi A4 Quattro Problems

Decreased 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. 

Possible trouble codes include: P0300P0301P0302P0303P0304, P0305, P0306.

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.

Fluid Leak From Transmission Output Shaft Seal

A fluid leak may develop from the propeller shaft seal on the rear of the transmission. Our technicians tell us that replacing the seal will commonly correct this concern.

Check Engine Light Due to Vacuum Leaks, Oxygen Sensor, or Catalytic Converter Fault

Vacuum leaks, oxygen sensor failure, and catalytic converter efficiency faults can cause the Check Engine Light to illuminate.

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2009 Audi A4 Quattro Questions

$228 for diagnostics Per complaint?? This is crazy right ? (3 answers)

My car is at Audi now , I've never used this dealer. I got complete inspection and diagnostics for $100 at the other Audi dealer a hour away. This one quotes me $228 for each complaint they check. $228 yo check the creaking sound in front. $228 to check why it's overheating. $228 to...

What makes the car stall, sputter, shake with epc light on? How much to fix? (1 answer)

Began suddenly after getting on highway. Then continued on the drive home with acceleration. I've read it could be the speed sensor. If so how much might this cost to fix?

Is there a brake wear sensor at each front wheel? (1 answer)

I am replacing brake pads and rotors. Thought the pads came with the sensor(s) and need to know if I should order one sensor or two.

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2009 Audi A4 Quattro Recalls

Air 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.

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2009 Audi A4 Quattro Reviews

I have had this car for two years and I love it. The handling on the rain its great with the factory tires but the suspension adjusts very well to weather conditions. I have top it @ 130mph and the car asks for more. I would recomend it to anyone.

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