Sorry it's so long, but please read and help! I have a completely stock 2001 Audi A4 1.8t quattro and got an APR chip installed by Achtuning in Redmond,WA. The car ran great for a few weeks, held 15-18PSI and pulled really strong, until suddenly it threw a CEL. Now the car will only boost 5PSI! If I reset the ecu the car shows no CEL and holds 15-18PSI again for about 5-10 minutes, then the CEL comes back on and the car goes back into this 5PSI safemode. I took it back to the shop and they said it was the cam positioner sensor, which I paid them to fix, and the problem still exists! APR told me to upgrade to an >03 A4 dv which I did, but still no fix! Achtuning told me the code being thrown is a "voltage code" but they don't know what to do to fix it. What should I do?!? I'm thinking it may be the coilpack, because of the voltage code, any suggestions? This 5PSI mode is driving me nuts!!! PLEASE HELP, and merry christmas.

If you paid them to fix it and they didnt i would take it back there. Without knowing what the code is its almost impossible to know what the problem is.

Like dankhound said, it's their job to fix it. You didn't sign some waiver saying "You can work on my car, screw it up, and I won't hold you responsible" did you? Part of the service of the install of the chip is to get it right. So tell them they have to get it right. They are the experts, and have held themselves out to the public to be experts, so now they need to step up and show some expertise. If they can't do it, then they should return your car to the shape it was in prior to their touching it and then you go from there.

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Don't mind me. I'm just drifting thru.