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o2 sensors

  1. Aftercat 02 sensor voltage 1-3 and 4-6

    E46 Xi Forum
    2003 330 XI - Hi I just got new sensors put in so I can prep for inspection. On my way home, the check engine light came back on. I check the codes and it says: Aftercat 02 sensor voltage 1-3 and 4-6 What does this mean, voltage too high? Too low? Please help and thanks.
  2. P0420 / P0430 Catalytic Converter Codes

    ///M3 Forum
    Hi all, I got some great info from previous posts on this topic, but I haven't been able to crack my problem yet. I'm hoping you all can help. 2002 M3 w/ 68K miles. CEL intermittently comes on, throwing the P0420 and/or P0430 codes. Also the "Rich to Lean sensor threshold voltage" is failing...
  3. Looking for reasonably priced O2 sensors

    General E46 Forum
    Hi, I have a 2003 325i (M54) that is in need of new O2 sensors or at least that's what our shops computer is telling us. I've been looking around for O2 sensors and I cannot believe how expensive they are! There's a little luck on my side that I am the IT manager of a repair shop and have access...
  4. HELP! 15-18MPG Excessive Fuel Consumption 320i_ 16-19L/100km, miss daisy driving

    General E46 Forum
    Hi all e46 fanatics. 2002 320i facelift M-Pack2, M54B22 Engine, Orient Blue, Japan import. 64,000km on it. Just bought it and I just love this car especially the handling is outstanding. But it suffers from excessive fuel consumption 16-19L/100km it's 15-18 MPG (driving like miss daisy), this...
  5. Fuel Bank 1 and 2 Rich Code

    General E46 Forum
    Having a recurring issue with my 2005 330i. It keeps throwing the Fuel banks 1 and 2 Rich Codes (I believe P0171 and P0172 or some thing very close). Seems to be every so many miles I drive. Every time it throws the code and I go in a read it, there are four codes total showing. The first two...
  6. Bypassing post-cat O2 sensors easy? How do they work exactly?

    General E46 Forum
    So, after 331K, the post-cat O2 sensors are finally throwing faults (surprisingly, in unison) in my 325Ci. Firstly, can I safely assume that the post-cat sensors on an E46 have no effect on performance, and are there solely for emission control? If so, assuming the heater circuits are still...
  7. Bosch 15738 O2 Sensors on Amazon

    DIY: Do It Yourself
    Time to replace some O2 Sensors. Found these on Amazon. Super cheap at $52.96. Bosch 15738 (Universal fitment) (and right now there's a clickable coupon for 15% off) This specific model comes with a wiring kit that lets you wire up your old harness to the new wires. I guess that's why it's so...
  8. System Lean Both Banks P0171 & P0174

    General E46 Forum
    I have a 2004 E46 325CI with the M54 engine in it. A few weeks ago, my check engine light came on. I didn't think much of it as I was getting on the throttle pretty good getting onto the interstate (figured it was just a retarded O2 sensor due to my lead foot). Took it to the shop to get the...
  9. Need help please on my323ci

    General E46 Forum
    So I had to replace my oil separator and hoses . I replaced all my spark plugs & coils & O2 sensor. And it's still misfiring and SEL light is on.. Can some one please help I've spent a lot and I need some piece in mind and help me figure this out..please and thank you..
  10. rpm dip under hard acceleration

    General E46 Forum
    Hi guys been trying to chase down this problem with my 325ci Under hard acceleration cars rpm go up then there is a dip then away she goes, not so noticably in 2ns gear but higher gears more noticeably it is. For example if a hit the gas hard rpm will go to 3500 drop back dwn to 3000 before...
  11. 100k mile maintenance advice needed

    General E46 Forum
    Hey all, New to bmw with a 00 328i, and so far I have just replaced a control arm, cam pos sensor, and oil. Ignoring the rear differential thud noise for now, but it's at 108k miles, so it's general maintenance time. I have SES codes below that are I read with my generic code reader. I am about...