DTC: PO442

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12-06-2006, 02:02 PM

johnhon

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DTC: PO442

I pulled this code from my 98 XC. My Chilton manual says it's a Three-way catalic converter (TWC) efficiency. What should I check?
Thanks.

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12-06-2006, 09:17 PM

tech

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RE: DTC: PO442

Air leak,Exhaust leak,Mass Flow sensor,Cat.

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