Three problems related to engine have been reported for the 2004 Audi A4. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Audi A4 based on all problems reported for the 2004 A4.
I have a 2004 Audi A4 1. 8t. This exact model is what is described in the Audi manufacturer's 8 year extended warranty for engines. I am currently being denied warranty coverage for the engine sludge that has built up in the engine. The reason being according to university Audi in seattle, is that: my car is "too new. " but it is a 2004, the cut off year for the extended warranty.
Ignition coil failed in one cylinder on 2004 Audi A4 1. 8t quattro. This part on Audis repeatedly fails. Loss of power, very shaky at idle and acceleration. $400 to repair, but now catalytic converter is ruined due to the cylinder misfiring.
Engine has an repeated but intermittent loss of power. Usually occurs shortly after starting the car and before the temperature gage shows the engine running at normal temp. Engine continues to run, but when pressing gas pedal all the way to the floor, there is insufficient power to move the car. Also, when in neutral or park, rpm barely goes above 1500 when pedal fully depressed. After waiting a few seconds for sometimes as long as a minute, engine will regain power and will then operate normally. This has happened at least 10 times from oct07 (when purchased car used) through 22 April. Manufacturer technician is unable to locate problem.