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

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.

Asked by for the 2001 Toyota Tacoma
yes an air leak could cause this issue reseal 1st and see what happens
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yes it could