Two problems related to engine failure have been reported for the 2006 Audi A4. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Audi A4 based on all problems reported for the 2006 A4.
Audi issued a technical service bulletin that I found on your website. This bulletin was regarding the exact parts the dealer (Audi) identified as being affected on my car (high pressure fuel pump, cam follower, and corresponding intake camshaft cam lobe). This bulletin (not a recall, but distributed internally to dealerships) clearly states that this is a widespread issue that affected all VIN ranges of specified Audi models from 2005-2007 that included mine. Audi extended drivetrain coverage on these vehicles to 10yr/120k mi. This issue causes a worsening loss of power upon accelerating (making driving at all speeds dangerous) and eventual engine failure if left alone. I am the 3rd owner of this car, so I did not receive the intended letter from Audi stating the specifics of this coverage extension. My vehicle is currently at ~110k miles at the time of this service (~4-5 days ago). Upon bringing this bulletin to the attention of Audi service manager, he did not ask me for the bulletin number or revision, he just denied covering it verbally saying the coverage was "10yr/120k mi, whichever came first" but would not send me a copy of the extension letter proving this. The cost of repairs related to this issue is ~$5,600. I opened a case with Audi of America. I provided the requested info, and was still not sent/emailed a copy of this letter, or proof that it was sent to the owner of the vehicle. I was told cases take up to a week to review (they would need me to provide service records for the vehicle, etc). I was called less than 24hrs later that the case was denied, before I provided any info or pled my case that a company with the slogan "truth in engineering" should stand behind an acknowledged engineering flaw. Repairs are ~1. 5x the value of the car. I don't have the money to fix this and it creates an unsafe driving condition. Please help.
At highway speed, the low oil pressure light came on, before the driver was able to move to the side of the road the engine failed. The car was towed to the Audi dealer and after two days the dealer quofed $7000 to start working on the engine. Technician found the timing slipped and valves were damaged. The oil level was fine, but the dealer did not determine why the oil pressure failed. Sounds very similar to class action law suit for A4's through 2005.