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check engine

  1. 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...
  2. M52tu throwing codes after vanos seal replacement! HELP!

    General E46 Forum
    Alright guys i'm as a loss. last weekend i did a valve cover and vanos seal replacement. After i got it all put back together it immidialaty stated throwing codes. I DID however forget to plug in the intake solenoid electrical connector. i took the car on a quick spin and quickly realized...
  3. New MAF - check engine / eml ??

    General E46 Forum
    Hi guys, I like to keep my car as close to new as possible. I changed all the filter and oil recently and still have about 12 K KM until the next service. I found a very nice new MAF from Pierburg, only the sensor without the housing at a good price and installed it. My bad, I forgot to...
  4. code p0335, crankshaft position changed still problem

    General E46 Forum
    my car not ruining great rought idle, ruff start and code p0335. I changed that sensor and the check engine is still on. The idle is the most terible when A/C and/or defrost is on. Someone got this issu and solved it. Sorry for my english i speak french :p
  5. Service Engine Soon Inquiry

    General E46 Forum
    So the service engine soon light came on and I took it to Autozone to get the code checked out. I think I fixed the problem actually. So does the service light go off by itself, or do I actually have to get it reset somewhere?
  6. OBD not working

    E90, E91, E92 & E93 - General Forum
    My case is I have a check engine light and my OBD II reader, and the fancy expensive OBD reader at my local independent BMW shop, are not able to get any codes. Both our readers keep coming up with a link error. Anyone have an idea what could be causing this? I think there's an OBD fuse, but...
  7. Loosing Power?

    General E46 Forum
    Hi Guys I was driving my car today 1999 323i E46 auto and I have noticed that when I am stepping on the accelator that especially when it passed the second gear that I felt like I have no torque power it drives okay and the engine seems like there is nothing work however but it felt like...
  8. Tranny Problem (Not the no reverse problem)

    General E46 Forum
    Ever since I've owned the car it always had the check engine light on with like 8 codes and once in awhile it would shift into what felt like 3rd or 4th gear after going around turns and stay there till I shut it off, and restarted it. But just this past Monday I replaced the fuel filter (who...
  9. Check engine light will not come on for smog.

    General E46 Forum
    So I went to have the smog done on my 2003 325i. The shop said they can't do it cause the check engine light doesn't turn on during the bulb check when you first turn the key. And they need to see that light come on as part of the smog. But if I do a cluster test the check engine light will...
  10. O2 Sensor issue after headers

    Driveline, Engine & DME Tuning
    This problem has been going on for about the last 2-3 weeks. I have ceramic coated headers with o2 sims that I bought from Anthony at Bimmerbrakes... So here is what happened. 2 Weeks ago, I got a SES light, pulled codes and got O2 SENSOR HEATER CIRCUIT VOLTAGE TOO LOW I reset the code, but it...
  11. Need HELP!!!!!

    General E46 Forum
    2004 330xi So about 4 months ago my check engine light turned on and my tps light turned yellow. When I took it to BMW they told me that my passenger speed sensor went bad and my ABS controller module. I changed both and are still having the same problem. Can someone please share some info. My...
  12. 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...
  13. Only two weeks to pass emissions--help!!

    General E46 Forum
    This is my first post as I'm new to this thread. I've got in '01 325ci with headers installed and an AA Supercharger kit and need to get through emissions in Tennessee. I've only got about two weeks before the deadline! The codes on the check engine light read two reports of being below...
  14. Fuel Mix too Lean

    General E46 Forum
    hey all, my check engine light came on and i had it looked at. o2 sensor is throwing a fuel mix too lean sensor. mechanic said it only threw it once and reset it for me and said we would worry about it if it happened again. what might cause that and what would be the fix. thanks for the info.