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oxygen sensor

  1. Misfire and Cylinder cutout on 1,2,3,6

    General E46 Forum
    Hi all, new to forum but have found loads of help from lurking and reading past posts to fix my BMW. Little bit of background on my car: Have a 2002 330ci manual, about 125k mi and as far as I can tell is pretty much original everything (except what I have done to it) brake buster vacuum...
  2. 325i throwing oxygen sensor codes

    General E46 Forum
    After getting my warped head gasket, cracked expansion tank, and clutch replaced I've been getting oxygen sensor codes. I've read around that it isn't always as simple as a bad oxygen sensor, so before I go out and buy some new ones, I was just curious about what other issues may cause o2 sensor...
  3. Oxygen sensor replacement questions

    Driveline, Engine & DME Tuning
    My car is an 05 330i zhp with about 170k miles. It still has the original oxygen sensors and I’m trying to determine if it’s necessary to replace the o2 sensors as preventative maintenance. I don’t have idle issues or any check engine lights at the moment. Every other preventative maintenance...
  4. oxygen sensor stuck in lean condition

    General E46 Forum
    Hey, so another problem started last night. i had these intermittent loss n power at 80mph ( like stuttering ) which would go away once i fet go off the throttle and went back on it again ( this is only when i am trying to accelerate slowly if i am accelerating a bit hard like 65%throttle...
  5. Misfiring on Cylinders 1, 3, and 6(Help!!)

    General E46 Forum
    So I have replaced the oem headers with aftermarket catless headers. I’ve been driving with CEL on and I want to try and fix the misfiring problems. I’ve got 3 misfires on my engine. I only have the o2 sensors that go before the cats on and the ones after the cats are off. Recently I have...
  6. Pre cat 02s

    General E46 Forum
    So I have some pending codes that aren't hurting my car but I tried to get them off anyways for fun. Yesterday I swapped my existing pre cat 02s with each other and my car ran like a POS haha. It immediately went into limp mode and I just switched them back and the car runs almost perfect again...
  7. Need help removing very stuck O2 sensor

    General E46 Forum
    I have had a fun time the last few days...yes, days...trying to remove a post-cat oxygen sensor that refuses to dismount from its factory hole. The car has 335K on it, so it's no surprise it's rusted to hell, but I am starting to get to that stage where I'm out of options, but I just can't see...
  8. Any E46 2 Bosch Pre-Cat O2 Sensors

    Miscellaneous BMW and E46 Parts
    Purchased these by mistake. I needed the post-cat O2 sensors instead. BNIB. Asking $150 for both.
  9. Any E46 2 Bosch Pre-Cat O2 Sensors

    Engine & Performance
    Purchased these by mistake. I needed the post-cat O2 sensors instead. BNIB. Asking $150 for both.
  10. O2 sensor help .

    General E46 Forum
    Hey i was told by someone that if one short term fuel bank was running at 4.7 and one at 9.4 . Then my first is lean . He also told me to take a look at my o2 sensors but i dont really know what im looking for . Can anyone tell me if my o2s look like they have been running lean ? Or even rich?
  11. Oxygen Sensor Prodlems

    General E46 Forum
    Hi, I have just replaced my o2 pretty cat sensor on my first bank after getting a fault code. Reason I only replaced on is because the other one was the wrong type. But now since I replace it the new o2 sensor is throwing miss fire codes for 1 and 3 and 2 fuel trim malfunctions any help would be...
  12. Help with Emission readiness monitor.

    General E46 Forum
    My car had CEL from November of last year. Local mechanic changed a valve and said I am good to go. But the CEL came back again and it read P0491/92. I called the mechanic and he said secondary air is used only in cold start and its ok to drive it for a while. Done this till March and I took it...
  13. Is oxygen sensor same for pre cat Bank 1 and Bank2

    General E46 Forum
    Hi Guys I'm planning change my pre cat oxygen sensors. But my question is that are the two sensor same. Because I was looking at Advance Auto Parts' website, it has***65279; two upstream sensors, one is for cylinder 1,2,3, another one is for cylinder 4,5,6. Are they same or I need buy each...
  14. o2 sensor question

    General E46 Forum
    I need to change my o2 sensors however looking at realOEM I'm still confuse which one are the ones you see on the right side of your engine by taking the engine cover and the ones you need to get under the car. RealOEM says I need part # 11787523434 11787523435 for that one that appear to be...
  15. Idle Issues on start-up and have codes. Please Help!!!

    General E46 Forum
    So i have an issue with my 2000 323Ci. The car once in a while idles a little odd (goes up and down but has yet to stall) However driving it for a couple minutes it is alright But it does not happen all the time but i would like the fix it before it becomes any worse. I get the following...
  16. DENSO OXYGEN SENSOR - Fanatics inquire within

    General E46 Forum
    Like many others on this forum, my SES is on and peake tells me it is one of the pre cat oxygen sensors (off the top of my head i can't remember which one....irrelevant). My ride has 106 k 2002 325 XI. I've read the pre and post cat DIY's. I know bosch is 'OEM', but i decided to go with DENSO...
  17. need help car stalling check engine light on

    General E46 Forum
    I have a 2000 coupe the car started stalling and then check engine came on, i check the codes in auto zone they told me the oxygen sensors both pre cat was bad i change both did'nt fix the problem so far this is all i have done cleaned the maf sensor ,cleaned the idle control valve, changed 2...
  18. oxygen sensor question...

    General E46 Forum
    so i just read my codes and it says me bank 2 sensor 2 is not working and i just was wondering if this meant the farthest one back? and could it just be unpluged? im lazy for not jacking up the car and checking but i dont want to buy the part and replace the wrong one with it ha thanks.
  19. How to Do a Smoke Test?

    General E46 Forum
    Greetings Everyone, I've been dealing with a persistent oxygen sensor adaptation limit error on my 2003 325i. Having read numerous posts I see I need to do a smoke test to find the intake leaks that are triggering this error. I have access to a good smoke machine, but I need to learn how to...