Audi RS4 Common Problems and Solutions
Loss of boost
Problem:
If you have begun to notice a loss of boost on your RS4, then the DV (diverter valve) is known for failing. The diaphragm in the DV is known for tearing, which causes the failure.
Solution:
You will need to fit a replacement DV, in order to resolve this issue.
Difficulty level
Tumble flap failure
Problem:
It has been known for the tumble flap to fail on the RS4. This is caused by a failure of the intake manifold flap motor.
Solution:
Fitting a replacement intake manifold flap motor will fix the problem.
Difficulty level
Engine Misfiring
Problem:
If you find that your engine is misfiring, then a usual cause of this, is for the coil pack to fail.
Solution:
This problem is subject to a recall, and Audi should fix it for you, free of charge.
Difficulty level
Lack of power
Problem:
If you find that the vehicle is lacking power, then the usual cause of this problem is for the MAF (Mass Air Flow) sensor to fail. They have Bosch sensors fitted as standard and a higher than normal failure rate.
Solution:
The first thing to try is removing, and cleaning the MAF sensor, otherwise replacing the MAF sensor will be the way to fix the problem. Have a look at the video below, for an idea on how to remove the MAF sensor:
Difficulty level
Overheating
Problem:
If you have started to notice that the engine is overheating, then this is a common problem with these vehicles. It is known for the coolant sensor to fail, or for the thermostat to stick.
Solution:
The first thing to check is the coolant sensor and if this is the cause of the problem, you will need to fit a replacement one. If this is not the issue, it will most likely be the thermostat, which you will need to replace, in order to resolve the issue.
Difficulty level
Coolant Level Sensor
