Quote:
Originally Posted by Faderaudi
Hey racermp,
Not sure if you ever figured out your issue with the P2421 code on the N55 but my '11 335i just fell victim to the same problem. I went ahead and replaced the fuel tank breather valve connected to the intake throttle body, reset the code, and two days later it's back. Only thing I can think is perhaps the DMTL pump could be the culprit. I'm at my wits end and you are the ONLY person I can find that's experienced the same issue with the N55.
Did you ever squash the gremlin in yours?
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hey, the dealer said DMTL pump. and i heard the pump make a rattling noise after the car was turned off. so i suspect it's true. however the code has not come back on for the last few months. i did install MHD, maybe they cured it lol. no idea but no issues so far.