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Thread: Stomp test code 1264

  1. #1
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    Stomp test code 1264

    Sometimes I have to realize that my English still needs to be improved.
    My CEL came on today with the code 1264 which is EGO heater.
    What is it? My EGO is OK as far as I can judge
    And I didn't know it needs to be heated either

  2. #2
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    Does the oxygen sensor have a heating element ?
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  3. #3
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    .
    Attached Files Attached Files

  4. #4
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    Yes, both sensors are being heated constantly. So it could be a defective heating of one sensor? I just don't know what EGO stands for.

  5. #5
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    "ECO" or EGO? EGO is usually a bad or missing o2 sensor.
    Last edited by 8eights; 07-27-2014 at 04:26 PM.

  6. #6
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    1264
    Lambda (O2) Sensor Heater
    This code is stored if there is a break or short-circuit at:, - Oxygen Sensor Heater, - Sensor heating relay, - Wire from the DME control unit. Check the Oxygen Sensor Heater Relay and Air Pump Relay and the supply wires.

  7. #7
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    thanks for all your input. I'll check the heating circuitry.
    I remember to have had a blown fuse on my yellow 850 once but can't remember if it is one fuse per sensor or one for both of them.

    - - - Updated - - -

    I just found out it can't be the fuse (#28) because it supplies current to both sensors.
    So it must be the sensor itself.

  8. #8
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    I miss my E31!!!!!!!!!!

  9. #9
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    Quote Originally Posted by wokke View Post
    thanks for all your input. I'll check the heating circuitry.
    I remember to have had a blown fuse on my yellow 850 once but can't remember if it is one fuse per sensor or one for both of them.

    - - - Updated - - -

    I just found out it can't be the fuse (#28) because it supplies current to both sensors.
    So it must be the sensor itself.
    So Wolfe, did new O2 sensors fix the problem?

  10. #10
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    Quote Originally Posted by Dr. T View Post
    So Wolfe, did new O2 sensors fix the problem?
    They are on the way so I don't know yet, but I'm 99,9% sure that this is the issue.

  11. #11
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    Exhaust Gas Oxygen

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  12. #12
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    One question.
    Where is the air temp sensor on the s70?
    Is it the maf?

  13. #13
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    Fatandre: The air temperature sensor is mounted on the back of each intake manifold. See section 13 62 511 in the repair manual.

  14. #14
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    Quote Originally Posted by revtor View Post
    Fatandre: The air temperature sensor is mounted on the back of each intake manifold. See section 13 62 511 in the repair manual.
    Thank you Revtor

  15. #15
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    Problem disappeared.
    I ran my car temporarily on CSi DMEs (069) to see if it makes any difference and that's when this happened.
    Now back to the original 352 DMEs and no more CEL. I wonder if one of the 069 DMEs is not 100% OK because I got the failure code only on bank 1. Bank 2 was fully ok.

  16. #16
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    What happens if you swap the CSi DME's around ? Does the fault move with the DME?

  17. #17
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    Quote Originally Posted by Omega man 1969 View Post
    What happens if you swap the CSi DME's around ? Does the fault move with the DME?
    Good question. No clue because I found out after the 352s were installed again and I didn't bother to investigate.
    I'm a lazy bastard you know.

  18. #18
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    Maybe you just discovered what's different about the CSi-specific O2 sensor....

  19. #19
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    Quote Originally Posted by Dr. T View Post
    Maybe you just discovered what's different about the CSi-specific O2 sensor....
    I doubt that there is any difference. Those lambda probes are IMO all the same.
    And besides that the issue was only on one bank, should have been on both then.

  20. #20
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    some harnesses have an extra relay that drives those lamda heaters, some do not.
    That may have something to do with your issue (should you have that relay) or it may be that the other DME's are looking for that relay and it isn't there.

  21. #21
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    Quote Originally Posted by cartoonz View Post
    some harnesses have an extra relay that drives those lamda heaters, some do not.
    That may have something to do with your issue (should you have that relay) or it may be that the other DME's are looking for that relay and it isn't there.
    again doesn't explain why the failure message was only for one bank while the other one was fully ok (code 2444)

  22. #22
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    Quote Originally Posted by wokke View Post
    again doesn't explain why the failure message was only for one bank while the other one was fully ok (code 2444)
    if you say so

  23. #23
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    Quote Originally Posted by wokke View Post
    again doesn't explain why the failure message was only for one bank while the other one was fully ok (code 2444)
    I know I'm digging up an old thread from the way-back machine..

    My 1991 850i has the Shogun performance chips for a 750iL. Both use identical -352 DMEs. I've had them for ~6 years now, and have been pretty happy with them.

    For the longest time, I've had 2 codes on the first bank, 1264 & 1222. From the bmwcode.pdf (http://www.baumtools.com/bmwcodes.htm):
    1264 Lambda (O2) Sensor Heater -- This code is stored if there is a break or short-circuit at:, -Oxygen Sensor Heater, - Sensor heating relay, - Wire from the DME control unit. Check the Oxygen Sensor Heater Relay and Air Pump Relay and the supply wires

    1222 Lambda Control 1 -- This code is stored when the DME detects excessive deviations in the air-fuel mixture (too rich or too lean) for longer than 10 seconds. Possible causes: Fuel tank ran empty, Incorrect Fuel Pressure, Injector valve defective or coked, Engine Temperature Sensor defective, Secondary air leak, Fuel evaporation control system defective, Air Flow Meter defective and/or the combustion is being disturbed by mechanical failure (Spark plugs,, compression, intake/exhaust valves, ...etc.)
    (Bank 2 reports 1444 - no codes)

    My O2 sensors were replaced a few years back, maybe they've got 20-30K miles on them.

    I just checked the ETM for a ~1993 750iL and it has an O2 sensor relay that's driven by pin 37 of the DME (but only one relay for both sensors, controlled by bank 1). However, Interestingly, if I check the 1991 (or 1993) ETM for my car, the oxygen sensors are powered right from the ignition key via F28, i.e. there is no O2 sensor relay on either sensor, nor any feedback to the DME as far as I can tell.

    Further, If I check the "Electrical Troubleshooting and Diagnosis for E31" document, they mention, Defect Code 37: Sensor Heator: "Oxygen sensor heating relay activated by the DME control unit I, For this reason, defect is only stored in the DME control unit 1. The control unit detects a short or break at the relay or it's supply wire." Followed by "This defect code can be ignored if no sensor relay is installed"
    (Note: Cartoonz/Wokke, that's why you'd only see the code on one bank! I don't see where pin 37 is grounded on bank 2, but it seems pin 85 is grounded on bank 2 DME and that's how they know which role they're in)

    Do the chips contain all the program logic/code for their respective DMEs, or just tuning maps/tables? Does this mean I need to trick my DME to think it's powering an O2 sensor relay via connecting a sufficient load on pin 37? If the ET&D doc says "this defect code can be ignored, does this mean it might not actually throw a check engine light if it was a solo code?

    Code 1222 indicates any number of other issues I need to address, Anyone have experience with the 1222 code? My ignition coils/plugs/cap/rotors were new a few years ago. I have noticed my coolant temperature gauge seems to be below midpoint when it's cold out, and It seemed like it was overheating once this past summer, though would correct itself very quickly. Suppose my thermostat is shot and stuck partially open, would a barely under temp car (one tick low) cause this code? Could my EVAP system be shot?
    Last edited by EEDegreeToDrive; 02-12-2018 at 12:04 AM.

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  24. #24
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    That's interesting information - AFAIK, the model differences (such as Lambda relays for instance) are part of the main EPROM - that certainly was the case on the V8's.

    1222 is a bog-standard error code for lack of mixture control (adaptations reaching their limits) - the usual cause being manifold gasket leaks, or other vacuum leaks around the manifold such as the PCV valves. I don't know what the extent of diagnostics are available on the V12 - but on the V8's we can differentiate between a lean mixture (caused by vacuum leaks) and over-rich mixture (caused by misfires).

    If you can get the live data up, then this should help:

    http://www.meeknet.co.uk/E38/Diagnostics.htm
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  25. #25
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    1222 = the A/F ratio is excessively rich or lean. Common causes include:

    air leak
    defective MAF
    bad engine temperature sensor
    incorrect fuel pressure
    problem with injector(s)
    defective evaporation system
    issue with spark plugs

    A smoke test of the intake will quickly tell if there is an intake leak. But a leak at the oil filler cap (my car once had a crack in the oil filler cap) or dipstick o-rings might still be a possibility if the car passes the smoke test.

    2 years ago we had similar case on an E32 750 M70. And we even could hear a hiss coming from the engine bay. Turned out to be an intake gasket.
    Another case, check the 2 breather valves in front of the engine, we found that here http://e32b12.blogspot.jp/2012/09/m7...ble-fix_5.html
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