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Old 06-02-2020, 08:45 PM
shakmonster shakmonster is offline
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Location: Chicago, IL
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Mein Auto: 2008 BMW 335xi
F01 Drivetrain malfuction

Hello all recently I encountered a check engine light as I was driving with a message that said "drive train malfunction loss of power." When I read the code on my scanner it said cylinder three is misfiring. Prior to this I changed all sparks and both left and right PCV valves car was running smooth until this issued occurred. As of now I took out the cylinder 3 spark and cleaned it and the coil pack put them back in and got the same problem any tips/help would be appreciated.
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Old 06-03-2020, 08:22 AM
Poncherello Poncherello is offline
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Mein Auto: 2013 750Li
It's a bad coil on #3. I got the same error last summer/fall. Under hard acceleration at first then progressively got worse. Came up drivetrain malfunction error. When I checked the codes I had a misfire of #3 and #7. I was about 10-15K miles over due for spark plugs at that time. I replaced the spark plugs and all the coils myself and no issues again. I would suggest replacing all the coils just because when one goes bad others will as well.

BMW wanted about $1500 for that job. My mechanic wanted almost $1100 for that job. I bought everything on RMEuropean for $265 including overnight shipping. Took me about an hour or hour and a half to do the whole job.

Last edited by Poncherello; 06-03-2020 at 08:23 AM.
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Old 06-03-2020, 08:53 AM
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isstatu1 isstatu1 is offline
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Mein Auto: 2010 750Li
Swap cylinder 3 coil with cylinder 4 or any other and see if the error moves along. Then you'll know it's a bad coil.
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Old 06-04-2020, 07:29 PM
HerbP HerbP is offline
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Location: Georgia
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Mein Auto: 05 645Ci, 14 750 M-Sport
Swap the COP to a different cylinder, & see if the problem follows the COP. Misfires can be caused by a bad spark plug, a bad COP, or a bad fuel injector. If the problems is caused by the fuel injector, there should be a goodwill replacement on it. Call BMWNA & ask them if you injector would be covered at no charge.
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