[Bmwfanatic1985]

Hi everyone. I have a 2014 ActiveHybrid 3 I recently purchased. The other day while driving the serpentine belt snapped on me. I believe this was due to OFHG gasket leaking oil onto the belt over time. I got a new belt, cleaned up the area of all the old belt as best as I could and installed it. I don't think any of the belt got past the crankshaft pulley seal as I didn't see any leaks there. Now I noticed after the new belt install that the engine seems to have a misfire\shaking whenever the engine warms up. I will try to get a video to show what is happening. Also when it does this the auto start and stop function fails and I get a drivetrain malfunction error. Can anyone or someone tell me what could be my issue?

[obert]

I would replace the belt tensioner as well. Those do go bad. Not saying that’s your issue but it wouldn’t hurt to change it.