2000 E46 323ci eml light has come on? where the diagnostic port?

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  1. 2000 E46 323ci eml light has come on? where the diagnostic port? 
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    been driving around a couple of days now and noticed the mph has dropped to around 25mpg at 70mph, usually 31!!!, now i have also noticed the exhaust from the front somewhere has started blowing a little bit. the eml light has just come on on the way home!, so i have borrowed my mates ethos snap-on reader, is this ok to check the codes? and where do i plug it in? thanks.. if this won't work is there another way to get the codes??? mark.
     
     

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    Your car may have 2 ports.One under the drivers side footwell-a little flap needs to be pulled down which will expose the port and one in the engine bay which will be a round pin port-usually near the driver side strut IIRC
     
     

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    Use the one under the bonnet if you have 2 ports.
     
     

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    i don't know whether to post in this 1 or make another thread, i cleared the fault code stored and the eml light has gone out, but the code i got was

    P0170 fuel blank trim...

    what does this mean?? thanks Mark.
     
     

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    Quote Originally Posted by vauxfan View Post
    i don't know whether to post in this 1 or make another thread, i cleared the fault code stored and the eml light has gone out, but the code i got was

    P0170 fuel blank trim...

    what does this mean?? thanks Mark.
    Most likely a lambda sensor fault.

    You should also get the fault codes read with a BMW specific scanner as PXXXX codes are not strictly BMW fault codes and you may be missing out on more precise info that specific BMW fault codes will give. You may also find you get new codes that a EOBD code reader won't pick up.

    And are you sure the code wasn't Fuel trim bank 1 ?
     
     

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    Quote Originally Posted by Ronnie View Post
    Most likely a lambda sensor fault.

    You should also get the fault codes read with a BMW specific scanner as PXXXX codes are not strictly BMW fault codes and you may be missing out on more precise info that specific BMW fault codes will give. You may also find you get new codes that a EOBD code reader won't pick up.

    And are you sure the code wasn't Fuel trim bank 1 ?
    yes ronnie you are right it is Fuel trim bank 1
     
     

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    ps, how do i know which sensor that relates to? controller of oxygen sensor?,
    isn't there 4 on this car?
     
     

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    Quote Originally Posted by vauxfan View Post
    ps, how do i know which sensor that relates to? controller of oxygen sensor?,
    isn't there 4 on this car?
    Yes, I would get the fault codes read with a BMW specific scanner first, then clear the fault codes(and if necessary reset the adaptations) then I'd drive the car and monitor the lambda sensors on a graphing scanner. Most likely going to be a Pre Cat sensor at front of engine.

    If they are the original sensors then generally they are good for 60-80,0000 miles as a rule. After this they can deteriorate which can only be found by using a graphing scanner or waveform scope/oscilloscope.
     
     

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    Bank one is cyls 1-3...

    Now, i know you'll be looking as GSF and ECP for lambda sensor faults, but that's not going to be the cause. That would be another case of shooting the messenger.

    The exhaust blow can pull in clean air and pass this over the lambda sensor, making it look like there is an excess of oxygen in the gas stream.
    The ecu will compensate as it assumes there isn't enough fuel, and it'll keep adding fuel until the o2 is burnt.

    In this case, it'll never reach that level, as the air is getting in after the combustion.

    Get the blow/leak sorted first, then see again if the problem remains.
    It'll be an MOT fail, so it'll have to be done no matter what anyway.
     
     

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    cheers guys, first job will be to get the car to the indi and put on the lift!, if i can find the air leak i can sort that first!, just need the correct point of blow, it is ironic that the eml light has appeared at roughly the same time the exhaust blow started. and the light only car on when i gunned it in 5th to overtake.
     
     

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