1999 E46 318i - Advice with code/E.M.L

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  1. 1999 E46 318i - Advice with code/E.M.L 
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    Hi, is there anybody out there with that can help answer my question?
    My car keeps throwing up a fault code (table 27, Ab on Peake to be precise) but my problem is I've been changing various parts I think might be related to the fault, I'm at the stage know that the E.M.L. light has not come on for a while but when I plug the Peake into the car I get the same code - even though I cleared the fault!
    Basically what I'm asking is "why does this fault register on the management system, but as yet, not flag up the E.M.L. light?"
     
     

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    There are different catagories of faults, and some won't put on the Check engine light.

    With the keys at the run position, read the code, clear it, re-read and see if it is still there without starting the engine.

    What was the fault code?
     
     

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    markyp (02-07-2010)

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    Thanks TheEnd, the fault code on my Peake is table 27, code Ab, which is "check fuel supply system" (Ronnie has said it relates to Fault code 171 mixture too lean or P0170 Fuel trim bank 1 malfunction. Most likely you have a air leak after the Air flow meter or before the Lambda sensor)
    With the ignition on, engine not running, I can clear the fault no problem, I can start and run the engine for a short time and still no fault. But if I take it for even a short run the code will be back, but no EML light on. So I don't know if the changes i've made have cured the problem or wether the fault is still there but the EML light just has'nt come on yet
     
     

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    Quote Originally Posted by markyp View Post
    Thanks TheEnd, the fault code on my Peake is table 27, code Ab, which is "check fuel supply system" (Ronnie has said it relates to Fault code 171 mixture too lean or P0170 Fuel trim bank 1 malfunction. Most likely you have a air leak after the Air flow meter or before the Lambda sensor)
    With the ignition on, engine not running, I can clear the fault no problem, I can start and run the engine for a short time and still no fault. But if I take it for even a short run the code will be back, but no EML light on. So I don't know if the changes i've made have cured the problem or wether the fault is still there but the EML light just has'nt come on yet
    is that code Ab or A6?
     
     

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    Big thank you sps, don't I feel stupid - been reading that as Ab for ages, makes more sense now - A6. Have recently replaced front lambda with a second hand one and it seems to have done the trick, fingers crossed.
     
     

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    Quote Originally Posted by markyp View Post
    Big thank you sps, don't I feel stupid - been reading that as Ab for ages, makes more sense now - A6. Have recently replaced front lambda with a second hand one and it seems to have done the trick, fingers crossed.
    yes A6 -translates from german to the following from table 27 of peak codes

    "Period time before the catalytic converter lambda probes".

    hence some sort of lambda related codes which would fit with your problem.

    it is funny how one sees and read things which we think are correct but are not-the peake code reader manual talks about this same problem on page 6-tip number 3.
     
     

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    Doh! should have quit whilst I was ahead, looking at page 6-tip number 3 (your ref.) means I was reading the fault correctly, it is 'AB' (the digital 6 is definitely a B). So now I'm back where I started, with fingers crossed, but so far the light has not reappeared.
     
     

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