2001 Toyota Tacoma Q&A

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

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. -
Answer 1
yes an air leak could cause this issue reseal 1st and see what happens -
Answer 2
yes it could -