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Thread: OBD2 fault codes but no warning light

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  1. OBD2 fault codes but no warning light 
    #1
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    Hi, I'm new to the forum and apologise if this is in the wrong section:

    I recently scanned my car (Audi A3 2017) with an OBD2 scanner. It produced 3 error codes:

    P332500 - Power supply terminal 15, Implausible;
    P157000 - Engine Control Module (ECM) disabled;
    P334B00 - Charge pressure actuator, mechanical malfunction.


    I wondered if these were significant? I should mention that there has been NO warning lights appear at all in the few months I have owned the car (3 years old). Could these codes be stored in the computer from a previous, resolved issue? Or are they simply not significant enough to prompt a warning light? Had I not scanned that car I would have been completely unaware of anything. The car drives fine with absolutely no noticeable issues.
    Many thanks,
    Ian
     
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  2. Re: OBD2 fault codes but no warning light 
    #2
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    The standard thing to do when you scan a car for which you don't know the history is:

    Scan for faults [just to see what's there]
    Clear all the faults [temporary faults or cleared faults will disappear]
    Scan for faults again [to see what's faulty now]

    Julian

    By the way; many ECU 'faults' don't set any lights
     
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  3. Re: OBD2 fault codes but no warning light 
    #3
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    Hi Julian,

    Thanks for your response, much appreciated.
    I cleared the faults at the time and they haven't returned.

    Ian
     
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