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02 Mazda Protege' 5
Posted to Technical Discussion Forum on 2/4/2007 2 Replies

p0300 multi misfire,History... P0421 cat eff. failure...customer had exhaust shop repl 1/2 O2 sensor w/universal,TWC with universal TWC,knocked out WU/TWC!. I have replaced WU\TWC w/factory converter,repl 1/2 O2 sensor w/ factory,BAC valve replaced due to vac ... Login to read more.

2 Replies Received (View Replies)