BMW Questions? Ask a BMW Repair Expert for Answers.
are you sure it isn't p0171 instead of p1071?
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P1345 - Misfire Cylinder 2 with Fuel Cut-Off
Most likely a bad plug or coil on cylinder 2. You can swap the plug and coil around to different cylinders to see if the fault follows either. If not the plug or coil, possibly the injector.
P1349 - Misfire Cylinder 4 with Fuel Cut-Off
Same as above
P1071 is a valve timing code. It is too generic to provide insights. You will need to have the car scanned using a more sophisticaed tool in order to determine what is causing this code. There is no way to diagnose a timing issue using a P code I'm afraid. The timing system on this is car is hugely sophisticated so trying to use a p code reader to diagnose this would be like using a mid 1990s motorola cell phone to try and launch the space shuttle.
If it is indeed P0171 then that would indicate an intake air leak.
It might be worthwhile solving this issue prior to chasing the above misfires as they could be related. Also, would be worth clearing the codes and seeing which come back, this may be an old code that just was never erased.
I hope that is helpful, please let me know if you have further questions, or if I can clarify anything for you.
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