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  1. Miscellaneous BMW and E46 Parts
    Purchased these by mistake. I needed the post-cat O2 sensors instead. BNIB. Asking $150 for both.
  2. Engine & Performance
    Purchased these by mistake. I needed the post-cat O2 sensors instead. BNIB. Asking $150 for both.
  3. General E46 Forum
    I've been reading up on O2 sensors and have a general question I was hoping I could get answered here. In order to optimize fuel economy, is it critical that both the pre-cat and the post-cat O2 sensors are functioning properly, or do only the pre-cat sensors play a role in this regard?
  4. General E46 Forum
    Firstly, thank you the Fantastics family! When I bought my E46 4 years ago, I was afraid to open the hood. Thanks to you guys, I have become quite self-sufficient in doing my own repairs and maintenance :-) Here is the issue I am struggling with: 2004 330Ci Cabrio ~61,000 miles - New Spark...
  5. General E46 Forum
    Previously had a P0161 post-cat bank 2 sensor 2 CEL. Replaced all 4 O2 sensors with new bosch sensors. Code has not appeared since, but today CEL came on stating P1193. Post-Catalyst Fuel Trim System Bank 2. After some searching people are saying this is O2 sensor related? My sensors are brand...
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