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  1. E60 / E61 (2004 - 2010)
    2010 N54 535xi Hello all, Looking for some help here as I'm confused. Last night my e60 got some new parts, vrsf downpipes, racewerks coil packs, and a new o2 sensor (Bank 2 cyl 4-6). The MHD monitoring on my tablet is showing a huge spike in my AFR for bank 2 ONLY upon deceleration with zero...
  2. E63 / E64 6 Series (2004 - 2010)
    2010 BMW 6 Series 160K miles Hi, My engine light light is on. Fail message : bank 1 and bank 2 readings bad - replaced all 4 O2 sensors same fail codes ? Please advise.
  3. E63 / E64 6 Series (2004 - 2010)
    I am getting fail codes on Catalytic converter.. also on BanK 2 up and down on the O2. Do you think it is the Cat or the O2 sensors? or something else. ?
  4. X3 E83 (2004 - 2010)
    Replaced it today. What a pain in the butt! Easy procedure in theory: 1. Remove plastic engine cover (I keep mine off so that was already done) 2. Remove two e8 bolts holding bracket above o2 sensor and pull out bracket 3. Remove O2 sensor. 4. Put everything back Tools: 22mm 3/8 inch crows...
  5. E60 / E61 (2004 - 2010)
    Hello, I'm having issues with O2 sensor. Both 2C31 and 2C2B error codes popped up. I replaced Bank 1 Sensor 1 (pre-cat) with Bosh sensor and the errors are still coming back. :( I used this guide in order to locate and replace the sensor...
  6. E82 / E87 / E88 / F20 1 Series (2008 - 2014)
    HI all, I recently replaced my Upstream O2 sensor as it had failed (shorted). I ordered one checking the correct part (11787569930) and it arrived with a short (!) cable but the connector was correct so I extended it using my old cable harness (soldered + heatshink). Now I am constantly getting...
  7. E39 (1997 - 2003)
    Hey guys, hoping for some help with an issues ive been having recently on my '96 523i with 210000kms on it. Recently ive been having an issue where my car will crank for a short amount of time, fire up, but not run. It just fires up with no hint at idling. Now this doesnt happen every time, and...
  8. E46 (1999 - 2006)
    I only need my air cat and o2 monitors to come back on so that I can pass echeck in Ohio. I've tried the drive cycles on the Ohio echeck website, indestructibles, and from BMW themselves. I am currently in collage and need to get the car echecked by the end of the week before I go back to school...
  9. E36 (1991 - 1999)
    My e36 m3 evo "hesitates" under acceleration and when cold, theres a rich smell of fuel coming from the tailpipes. Did run diagnostics using INPA and both o2 sensors came up faulty. Both o2 sensors are brand new and ive cleaned the MAF. There are no leaks in the inntake system - ive used plenty...
  10. E36 (1991 - 1999)
    My temperature gauge sits about 2mm to the left if the middle line in my e36. In my e34 it sits right on that line. Does this mean i have a bad thermostat? The temp sensors have been tested and replaced, same issue. I have a check engine light for the o2 sensor (1221) that turns off at wide open...
  11. X5 E70 (2007 - 2013)
    I am getting the check engine light and the error code is P0050. I am trying to replace the bank2 sensor 1, but I cannot see the connector anywhere and I see the wire running behind the motor. Where can I find the connector to the O2 sensor? Images attached...
  12. E39 (1997 - 2003)
    Hi All! I am a new Bimmerfest member, and wanted to jump in with a global "thanks" to all who participate and share their info and experiences! You have "saved the day" for me on SOOOO many occasions! I am in NC / USA, and just took my car in for its annual state inspection. It failed due to...
  13. E39 (1997 - 2003)
    I've been searching the forums but can't quite find an answer. First a little history, bought the 98 528i three years ago with a cracked head from overheating. I Replaced the head, all new cooling system, new plugs, new fuel pump, and rebuilt the vanos. The only issue I've had is after...
  14. E30 (1982 - 1993)
    I have a 1987 325is. I put a new motor in it along with $2500 worth of random parts that it needed after sitting for 4 years. Long story short, I finally got it running and even passed smog two weeks ago after figuring out some rough idle issues. After putting about 150-200 cheerful miles on it...
  15. X5 E70 (2007 - 2013)
    100 miles after my 60,000 mile warranty expired I need a new pre-cat O2 sensor. Being a girl I hate feeling like I'm at the mercy of mechanics, but I am. Dont want to pay Stealership prices so I brought it to an Indy w high yelp reviews and he quoted me over$633 for part and $120 labor. Even I...
  16. E46 (1999 - 2006)
    I know this is the most common code we get but I'm running out of ideas on this. Here's the quick history got the codes replaced MAF a couple years ago replaced pre-cat O2 sensors replaced evap purge control valve (had p0444 code also) codes still on and still rough running on start up. Also...
  17. E90/E91/E92/E93 (2006 - 2013)
    I have had a 2006 325i for two year which I really enjoy minus a trunk reverse light issue that fellow bimmerfest members kindly helped me resolve. Thank You. A few months ago the check engine light would come on then go off a few hours or a day later. This happened a handful of times till a...
  18. E39 (1997 - 2003)
    Brand new to the forum so please excuse me if the answer is elsewhere or if I've posted in the wrong area. I've recently acquired a 1999 528i with high mileage but a meticulous service history. Here's the issue: RANDOM misfire that codes P0300, 301, 302, 305 and 306. I understand that the...
  19. E46 (1999 - 2006)
    My car just had an engine swap, and we want to replace the O2 sensors now. Some are faulty, and it's about time to change them. 125,000 miles, I was looking at the bosch sensors but I am unsure which ones to buy. I want to replace all 4 sensors for a 2002 325 CI. PLEASE HELP...
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