BMW 3-Series (E90 E92) Forum - View Single Post

CarAbuser · 04-25-2026, 08:16 AM

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.

04-25-2026, 08:16 AM	#35
CarAbuser Lieutenant Colonel 523 Rep 1,588 Posts Drives: Z4 35i DCT / E92 335i DCT Join Date: Jul 2010 Location: United Kingdom iTrader: (0)	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.
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