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o2 sensor
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  1. General BMW Questions
    My 2005 X5 (E53) failed SMOG test recently with O2 sensor not ready. Although I had a battery change, that was over 3,000 miles ago. I've performed the drive cycle four times (using various procedures found on the Internet). I'm starting to suspect bad O2 sensors. However, there's no check...
  2. E39 (1997 - 2003)
    As the tile says, I got a code for Lambdasonde 1 after replacing the bank 1 sensor itself. I replaced the sensor for cylinders 1-3(counting from the front of the engine). What could be the cause? Is it worth mentioning that the ECU is for a 97 528i and the engine is from a 95 e36 328i? Thanks in...
  3. E60 / E61 (2004 - 2010)
    Hi - this post is intended for other members who have difficulty getting their E60 ready for a smog inspection due to the O2 sensors not being ready. This problem has plagued me for quite some time, and I just got an answer on my own that I do not recall reading about. But knowing how many...
  4. E90/E91/E92/E93 (2006 - 2013)
    Hi there, In summary, test driving a '09 328i when it started raining near torrentially, which seemed fine as I slowed down for traction concerns with near an inch of water everywhere on road. All of a sudden, same throttle cruising in 6th at about 2100 rpm, the engine starts running horribly...
  5. E90/E91/E92/E93 (2006 - 2013)
    2009 BMW 328i with N51 engine and 142k miles Long time reader, first time poster. I have replaced the coils with new bosch coils packs, spark plugs were replaced with laser platinum NGK. This fixed the misfire issue for a few months. It then was back, misfiring on cylinders 4-6. I replaced the...
  6. E39 (1997 - 2003)
    (First time posting to a forum) I have a 2003 540i 6 Speed that is misfiring on cylinders 1-4. I have replaced valve cover gaskets, all coils, all plugs, CCV, intake manifold gaskets (including CCV gasket, and both throttle body gaskets). I have also replaced the jet pump that sits near the back...
  7. X5 E70 (2007 - 2013)
    Hey guys, could really use a bump on this thread. Ive got 4 o2 sensor codes showing lean upstream and downstream as well as a code for connection to pcm. Car has been stumbling at times for months before the codes showed up. Also, having intermittent random misfire codes. Could use some...
  8. E46 (1999 - 2006)
    Hello everyone. Having an issue with my '04 325ci M56. Couple weeks ago started idling rough. It was very seldom misfiring. Then it got worse, and I let it go until it stalled on me the other day. Figured it was time to bite the bullet and cringe as I hooked up the ol' OBD2. 2742: cyl 1...
  9. E39 (1997 - 2003)
    I need help interpreting these oxygen sensor scanned readings. 2003 525i 160k miles Both upstream sensors are new Bosch Both downstream sensors are original Previously I replaced the CCV which was causing a large leak Replacing the upstream sensors solved the readiness registers not setting Now...
  10. X5 E70 (2007 - 2013)
    Hey, Had this E53 for 4 years, now can't pass smog. Gives me P0141 code, sensor 1 bank 2, already changed sensor twice and still getting the same code. What can I do? what can this be? Running out of time on 2 month smog permit extension Thanks, trying to DIY since shops want an arm and a...
  11. X3 E83 (2004 - 2010)
    2006 BMW X3 3.0 Throwing codes p0171 and p0174 band 1 and 2 are too lean. I ran live diagnostics on the car while driving. The O2 Bank 1 and 2 sensors short term fuel trim is showing at a constant 92%. The data also says the fuel system is maintaining an open loop on system b. Why wouldn't the...
  12. General BMW Questions
    Hi all, Drive Cycle nightmares and misinformation. I have a low mileage X3 that has never had any problems passing emissions. I made the huge (I didn't know what I didn't know) mistake of taking the car to the dealer thinking an oil change was a good idea before the test. $2K later for various...
  13. E46 (1999 - 2006)
    I was reading the the ECU can be programmed to keep engine light off. Is this true or fantasy. My problem is one of the O2 sensors keeps causing a fault. I have changed it twice and tested it. They work but I still get the fault. Can a code be done or do you have other suggestions, Thanks
  14. X5 E70 (2007 - 2013)
    My X5d - 2011MY, June 2010 build, ~112,000 miles . . . O2 sensor was last replaced 5 years/~78,000 miles ago, Trying to eliminate weak O2 sensor as the cause for a 20% drop in fuel mileage. There are no CEL/MILs . . . trying to determine if O2 sensor is weak, but not weak enough to trip a...
  15. E30 (1982 - 1993)
    i have a 1988 325is and was doing smog test prep, new oil/ filter, air filter, plugs, seafoam treatment and o2 sensor. No CEL's before the maintenance, o2 sensor was last to be replaced, however with the sensor being changed last night the Check engine light came on while driving home from work...
  16. E36/7 Z3 (1996-2002)
    So I've just turned 100k on my 1998 Z3, and want to change the pre-cat O2 sensor. It's the early production model for 1998 so it has only one pre-cat. I removed the engine covers and searched for a bit but could see no sign of it? Does this model have it closer to the ground? Do I have to go...
  17. E90/E91/E92/E93 (2006 - 2013)
    FIRST TIME EVER POSTING. I usually just read.. but I am having a lot of trouble with my sisters 2008 328XI. She took it to the dealer for a SES and they told her she needed a new DMTL pump. I replaced that and still had the SES light on. So I had the code read at Autozone and they said it was an...
  18. E39 (1997 - 2003)
    I scanned and got these codes; p0155 is saying oxygen sensor heater ciruit bank 2 sensor 1. Should I replace both O2 sensors or would I have to do more ?
  19. E34 (1989 - 1995)
    I have a 1993 525i(automatic), and it seems to run rough a higher rpm's (like its getting short of fuel), before it shifts, and has extremely poor acceleration. There is an error code for the O2 sensor, i replaced the O2 sensor and the car still performs as it did before. If i am in park and...
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