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2001 Toyota Tacoma Question: check engine light is on , my code reader says P0420.

 

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kwbtacoma, 2.4L 4 Cylinder, Cherry Hill, NJ, November 13, 2012, 08:44
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i found that the nuts that hold the downstream 02 sensor on the pipe rusted completely off. could air leaking in cause P0420? i put hose clamps around it to hold it on. the light is still on after a few trips. putting new nuts and gaskets on eventually.

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