Hi,
I have a 2006 BKP passat sport estate. I have coming up every now and then a P0234 overboost fault. To explain this further it doesn't seem to have rough idle and up to 80mph runs fine. Under hard acceleration when warm I get a weird whistle noise. Like a boost leak. I can Still achieve nearly 50mpg at 70mph run. If I creep past 80 or give it a hard acceleration from 65mph it goes into limp mode returning a P0234 fault code. I can turn off and back on and it resets the car and return full power. However when I restart it struggles and vibrates a lot. I have noticed a hole in the intake pipe which I will rectify tomorrow. The conditions it does it in is when the outside air temp is above 11 degrees. Which sounds strange I admit, however after running from Liverpool to Heathrow and back again. Going to Heathrow loaded with additional 2 adults and one child at 1pm it went into limp mode twice and couldn't get to 80mph (yes i know speeding but who doesn't lol) but coming back I hit the m6 toll late at night with outside temp at 9degrees it could reach 90mph. I am wondering what should I look at first. I know the turbos can be an issue with this engine code. However I don't want to go in at 200 plus quid for a turbo and not resolve my issue. I am fairly familiar with cars and can take on most tasks myself. So am willing to do some digging myself. Any suggestions or help would be fantastic
Many thanks Bainsy
P0234 Overboost
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