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code p0420

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Old 03-26-2007, 01:28 PM
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he guys. thisis for a 96 z3 and it failed emmissions throwing that code.

it said catylitic system efficiency below threshold...

I've got an exhaust leak that is pretty loud...

could that have something t do with it. or are one of my cats failing and need to be replaced?

tia.
alan
Old 03-26-2007, 08:01 PM
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fix the exhaust leak, it is likely problem sovled
Old 03-26-2007, 09:00 PM
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only if the leak is before the cat it may,,,may throw it... prob just a insufficant cat.ive seen em go at 38,ooo miles.




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