2001 e46 n42 318i -FAULT CODE P0420 FIXED

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  1. 2001 e46 n42 318i -FAULT CODE P0420 FIXED 
    #1
    sps
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    the car is as above.

    ever since i bought in a few yrs ago,the emissions light would come on and the the same P0420 code(=Catalyst system efficeincy below threshold-bank1)would come up which i cleared.This continued every 200 miles or so and i would clear the fault.The car would drive without any problems and the emissions check was fine.

    then one cold december morning,the original battery died and i put in a new bosch one and the fault has never returned touchwood.

    so could it have been related to a dying battery all along?
     
     

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    #2
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    Kevin Whittaker's Car Details
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    Thanks for the update and useful information.
     
     

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    #3
    sps
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    sps's Car Details
    Model of Car:
    530d sport with genuine m sport kit
    Year of Manufacture:
    2003
    Transmission Type:
    a
    Car Body Type:
    saloon

    Join Date
    Nov 2009
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    uk
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    oops,the p0420 code came back again and so did the emissions light.
    but did so after a long time,say at about 800miles after the last time it happened.
    so have cleared the code and reset the light for now
     
     

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