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CEL light after MHD Tune

Discussion in 'DME / ECU Software Tuning' started by Ryco, Mar 23, 2020.

  1. Ryco

    Ryco Well-Known Member

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    I installed a catless downpipe and MHD stage 2 tune oct 93. I installed the tune today and it was successful flashing and cleared all my codes. I drove the car normal at first and then I started pulling the car to feel the power differences. I even raced my friend's rs3 and I won lol, but after that car was still fine. When I was driving back home from work 3 hours later not in "Sport Mode" I got a CEL and got worried. Help me diagnose this issue.



    Here is the code I pulled from it:


    - DME active codes -
    118001 - Mixture control: mixture too lean.
    21B055 unknown
    21B056 unknown

    - DME shadow (inactive) codes -
    30E1C unknown
    10D000 unknown
    11CF30 - Mixture control: Multiple fault.
    24000B unknown

    - Misc. information -
    MHD build: version 1.47
    Voltage 12.54V
    Last flashed file : v1.5 Stage2 93oct_98ron
    VIN: WZ1DB4C00LW030276
    Factory software:
    HWEL 3DDE v003_019_006
    HWAP 3DD1 v255_255_255
    BTLD 48DC v001_011_001
    SWFF 5D55 v060_110_005
    TPRG 6354 v060_110_005

    Current software:
    HWEL 3DDE v003_019_006
    HWAP 3DD1 v255_255_255
    BTLD 48DC v001_011_001
    SWFF 5D55 v060_110_005
    TPRG 6354 v060_110_005
    CAFD 2742 v000_171_006
    Current PRG (hex): 5D553C6E05

    ECU status: -

    - Readiness -
    Misfire: Complete.
    Fuel System: Complete.
    Components: Complete.
    Catalyst: Not avail.
    Heated Catalyst: Not avail.
    Evaporative System: Complete.
    Secondary Air System: Not avail.
    A/C Refrigerant: Not avail.
    Oxygen Sensor: Complete.
    Oxygen Sensor Heater: Complete.
    EGR System: Complete.

    62 25 02 00 00 00 04
     
  2. geert.bieseman

    geert.bieseman Well-Known Member

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    You can lookup the codes (mostly the active ones) here: https://bmwfault.codes/
    118001 = Mixture control: Fuel-air mixture too lean

    Are you actually fueled up with octane 93?
    Here in Belgium, stations advertise with octane 93 but sometimes it is a little bit below the value (as with all tolerances).

    Or maybe on an empty tank?


    I am always adding octane booster when I fuel up the car, just to be sure. But this is because the tune pushed the car to 'its limits', so it was recommended to use octane booster to make sure I am not getting misfires (knocking sensor kicking in).

    But than again, I am not an expert on cars :)
    There will be people here who could 'diagnose' this better :)
     
  3. OP
    OP
    Ryco

    Ryco Well-Known Member

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    Yea, I use 93 pump octane from shells. I dont know how true they are to 93 octane. I can try adding octane booster too see if that helps. Also, I am on half a tank right now when the CEL came on.
     
  4. cutsman

    cutsman Well-Known Member

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    Hmm, "Mixture too lean" just seems to tell me that the O2 sensor is detecting the changes in flow because of the catless downpipe. Does your MHD tune have an option to not detect the CEL for the downpipe?
     
  5. Twisted Tuning

    Twisted Tuning Well-Known Member
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    take a log and monitor your fuel trims and post the log here. thats a closed loop fuel system code.
     
  6. OP
    OP
    Ryco

    Ryco Well-Known Member

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    Okay, i will do that Thursday and post the logs
     
  7. OP
    OP
    Ryco

    Ryco Well-Known Member

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    That i do not know. I would have to get in contact with MHD about there tunes for this car.
     
  8. TURBOlence

    TURBOlence Well-Known Member

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    I want to know too. I'm also gonna go with MHD with a catless DP. What catless downpipe are u running?
     
  9. OP
    OP
    Ryco

    Ryco Well-Known Member

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    should i clear the code before running the monitor or run it while the CEL is on?
     

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