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Discussion Starter · #1 ·
I just purchased an 04 330ci with only 22K on it. The gentleman I purchased it from barely drove. A week after the purchase I started having some sputtering issues. I changed the recalled ignition coils, and changed a valve cover gasket that was leaking. # 3 is still misfiring underload at 2500 to 3500 RPM's. The diagnostic check is now telling me its an o2 sensor.

Any recommendations on the type of o2 sensor?
Should I disconnect the battery overnight to reset the computer?

Any other recommendations to fix this issue?

Any help is appreciated!

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