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Emission nct failure..

Max Headroom · 2009-10-31 10:05:02

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:

31-10-2009 10:05AM

#1

Max Headroom

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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...

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Comments

#2 31-10-2009 10:10AM

BrianD3

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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 31-10-2009 10:44AM

Max Headroom

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The reading was 1.236....probably high ......

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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