Audi A4 Quattro Repair and Maintenance

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

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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.

No Start after Refueling and Popping Noise from Trunk

Popping sounds from the rear of the vehicle may be heard moments after starting the engine, or when slowing to a stop. This noise is from the leak detection pump filling the fuel tank with air, and releasing to retest the system when it finds a fault. The sequence of faults identifying this issue are as follows:

  • Succession of loud pops from rear of vehicle
  • Pops go away, and fuel economy decreases 
  • Check engine light illuminatesT
  • OBD trouble code P2404 and/or P0441 is stored
  • Engine will not start after refueling (must crank for over 30 seconds)
  • Vibration when slowing to a stop

The cause is a valve which is mounted on the front of the intake manifold, commonly called the N80 valve, or EVAP system purge valve. The valve is designed to open under specific circumstances, but a worn valve will remain open at all times, preventing the pressurization of the fuel tank. 

Correction of the issue is to replace the N80 valve with the latest revision. 

Loss of Power Due to Torn Rubber Valve

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. 

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Audi A4 Quattro Questions

extended warranty - I just bought my leased2014 A4 and trying to decide whether (1 answer)

need to decide if to buy an extended warranty and which one - they offer 5 options- powertrain at about $2200 to a platinum which covers almost everything at $3424.

Whining noise when I turn the heat on in the morning Luke warm heat (2 answers)

Wining noise when I turn the heat on car not getting hot enough Luke warm heat every time in the morning start up

P0171 Crankcase vent valve problem help ASAP (1 answer)

Replaced the crankcase vent valve with OEM parts and light still hasnt turned off. I need help ASAP ive lost a lot of MPG and a lot of power!!!

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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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Audi A4 Quattro Reviews

I have the 2014 A4. It rides well. I take it to Midas for any mechanical needs due to the HIGH COST at the dealer. I have 58,000 miles and I just experienced a check engine for low oil light. This seems kind of impossible because I just had the oil changed at Midas. I will stop by the Midas shop to see what the problem is. Audi needs to put a better maintenance plan with the cars they are...
I have been in love with Audi's for a long, but unfortunately maintenance related issues have been burdensome.
my 97 audi a4 quattro does not accelerate with the gas pedal floor or half way .You floor it and wait for the car to gain speed trouble code p1136,p1476 band p0441 with 242652 miles it burn oil

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