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HELP Please P0420 code,Catalyst Efficency Below Threshold

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Old Nov 16, 2004 | 05:44 PM
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Question HELP Please P0420 code,Catalyst Efficency Below Threshold

My new Turbo Back set off this code because of the High Flow cat. I no there is a quick fix for it using 18mm spark plug anti-foulers. Does anyone no where I can buy these already pre made for this situation or do I have to drill? Please Help. Thanks
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Old Nov 16, 2004 | 05:51 PM
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You can buy these 18mm sparkplug anti-foulers at local autoparts store at the "HELP" section. Part number is #42009. it should cost no more than $5 for a pair.

For detail of how-to, check this link https://www.evolutionm.net/forums/sh...ad.php?t=98573

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Old Nov 17, 2004 | 06:38 PM
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Well I just installed the foulers and we'll see if the engine light stays off. Thanks for the help
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