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Emission nct failure..

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  • 31-10-2009 11:05am
    #1
    Max Headroom
    Registered Users Posts: 7,101 ✭✭✭


    My car failed the test on friday on emissions...the guy said it was because i had a small leak on the middle and back box ..as these are after the sensor and cat is this possible to affect the reading..?
    its a 03 megane and he said this was a common problem on this model...:confused:


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    #2
    BrianD3
    Registered Users Posts: 8,286 ✭✭✭BrianD3


    Yes, a leak downstream of the cat/sensor will affect the reading. It may cause the car to have a Lambda of >1.03 which is a fail.

    If the hole is small it may be possible to repair the exhaust cheaply rather than replacing it


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    #3
    Max Headroom
    Registered Users Posts: 7,101 ✭✭✭Max Headroom


    The reading was 1.236....probably high :confused:......

    Just had a look under..theres a pinhole in the weld at the mid box..and one on the rear box too...i'll get them welded up next week...just hope it solves the problem..the PinHole fairy strikes again...:rolleyes:
    tnx for the reply..;)


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