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      04-25-2026, 10:23 AM   #36
335xiE90
Private First Class
United_States
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Drives: BMW 335xi
Join Date: Jul 2022
Location: Massachusetts

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Quote:
Originally Posted by CarAbuser View Post
You probably need to replace the secondary O2 sensors. Your surging is caused by the DME running O2 sensor diagnostics, you can see it in the logs.

The secondary sensors are just as important as the primaries for a smooth running engine.
Noted. Those sensors probably have never been replaced, ever. I'm just gonna order them tonite, because everything else has been replaced one way or another.
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