gasguzzlingV8

skandalis447, Skandalis447, did you ever get to the bottom of the P0299? I'm also experiencing that code from time to time and think mine is temperature related, because it's worse in the summer, but also, sensor related, because I can clear the code while driving or turn off the car, and the error is gone. Cheers Chris

Hi All, I've owned a 2004 Cayenne Turbo now for a year and its a great car when all is working correctly. In the time that I have owned this car, I have been unlucky enough to receive a few error codes on the durametrics program I have or lately on the Rev Diagonistic tool I have for my iphone. I'd just finished fitting new parts for the fuel evap valve and a compressor rebuild kit, and re-setting all the codes in the ECU and all was fine, prior to going away, working abroad for 5 weeks, and all was good when I left. I've got back to find the battery flat (no shock there) but after re-charging it for a day, and going for a good long drive in the country, the car is now majorly playing up, giving me 5 error codes. These are : P0153 O2 sensor slow response (Bank 2, Sensor 1) - (Think this is fair enough, just wear and tear, getting old) but tonight I have this lot :- P0299 Turbocharger Underboost P0300 Random / Multiple Cylinder Misfire Detected P0306 Cylinder 6 Misfire Detected P0305 Cylinder 5 Misfire Detected Now could the above four codes be caused by a poor battery? I've put my multimeter across the battery and it's only about 12.5v sitting idle, although when the engine is on, it's getting the full 14v from the alternator. I'm looking to go and get a new battery next week, but do I go and get it from my local porsche dealer?? or can I get one from the volkswagen dealer (normally the same part as a toureg, but cheaper) or do I go and get one from a parts store?? lastly, I was on the phone to my local dealer this morning and I was asking about coding or re-flashing the ECU, and thing led to another and we got onto the subject of the error codes, storing them and re-setting them. They said to me "when fitting the likes of the oxygen sensor, or the evap valve, the part has to be coded into the ECU". Is this the same as re-settng the codes using the durametrics or Rev app that I have? They also said that, some programs like the bosch systems can't reset the ECU properly and only the Porsche centre computers that the dealers use can reset the ECU properly & fully. Is this BS?, because this is the first I have heard of this? Thanks in Advance Regards Chris