SOURCE: the system detected a leak
Replace the gas cap and clear the fault code, most times this clears the issue with code P0455. If it does'nt then you will have to have test equipment hooked up by the dealer to find the leak.
SOURCE: Audi A6 Allroad
jack the car up saftely then take the wheels off .. then you will see the brake calipier turn the wheel towards you so the calipier is facing you . at the bottom of the calp you will see a small bolt at bottom undo this and lift prize the calp up then remove 1 pad the inside on where the piston is then put calp back down and put the bolt back in just to hold it in place then when you have done this put a large stronge screw driver in via hole in front to push the piston all the way back but make sure you do the evenly and piston goes in straight or it will get stuck same with all types of brakes. once you have done this reopen calp and take the other pad out clean all area with a wire brush and replace the new pads in place,, and retighten bolt etc , before you start the other side please make sure you pump brake peddle until it goes hard again. then do same to over side ,
hope this is a great help matdav69
SOURCE: lurching start 2004 Audi A6
try the coolant temp sensor...if its getting the wrong readings then it will fuel accordingly....
SOURCE: brake lights stay on all time on audi a6 2004 model
The brake switch that is located just above the brake pedal is either out of adjustment and button is stuck on and you just need to move it around and put back in place. or the switch is faulty and needs to be replaced.
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