2012 Audi A4 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2012 Audi A4

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2012 Audi A4 Problems

Decreased Power and Fuel Economy from Carbon Buildup

The 2006-2017 Audi A4 uses the 2.0FSI, 2.0TFSI, and 3.2FSI 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 A4 uses direct injection so 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. 

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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2012 Audi A4 Questions

Audi A4 - Wastegate malfunction code 20299 (1 answer)

Recently experiencing a lagging in turbo and hearing a rattling underneath the car. Took it to Audi dealership to run diagnostic ($150.00). Result came back as wastegate malfunction and said needs replaced. Dealership estimate is $981.00 plus tax including labor. Is this a reasonable cost for thi...

Car starts but will not engage (automatic). engine sounds rough. Exhaust poor em (1 answer)

Intermittent problem generally first thing in the morning. Engine is running rough and car shakes all over. Engine appears to be flooded. Black smoke and strong smell of unburnt fuel out of exhaust emmission. Switch engine off and restart seems t clear the problem. Could it be faulty ejectors/ign...

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2012 Audi A4 Reviews

My 2012 A4 has a problem with the all 4 doors unlocking when the key is pulled out of ignition when it is set for only the drivers side opening. During the winter there would be an occasional gas smell in the car upon starting it after being off about 45 min after at least a 30 min trip. It is not happening so far in the warmer weather.

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