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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Ask Your Question2001 Toyota Tacoma
Question: check engine light is on , my code reader says P0420.
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Answer #1
globalhelper November 13, 2012, 13:07ReplyMasteryes an air leak could cause this issue reseal 1st and see what happens
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Answer #2
your.mechanic November 13, 2012, 18:33Reply
Masteryes it could
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