Thread: X5M rough idle?
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      04-14-2017, 12:34 AM   #5
TKR
Private First Class
United_States
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Drives: 2016 X5 40e & 2018 330e
Join Date: Aug 2015
Location: South Florida

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I had a rough idle for over 2 months (actually running rough all the time but noticeable when idle), and dealer was not able to identify problem.

One of the very first steps in dealer diagnostics procedure is replacing Air mass Sensors as they are know to fail. They will also smoke test the intake system to find leaks, and visually inspect exhaust leaks. They couldn't find air leaks.

In my case they found one cylinder misfiring and swapped new injector (warranty). It did not solve running rough problem. At this point they requested 5hrs work authorisation for further investigation. That would have been $1k just for labor.

Swapped plugs and coils myself. Was still running rough.

Finally took the car to another dealer. They immediately diagnosed faulty Air mass sensor on Bank1. I paid the diagnostics §160 and swapped the Air mass sensor myself.

Has been running smooth since then.
Appreciate 0