straight pipe past cat (HELP0

iwasajedionce

Member
:
2002 mazda protege 2.0 5spd
so i think i have a bad cat, i believe the code thats popping up is p0421 which ive read basically means the O2 sensors are picking up the same reading, meaning the cat isnt doing its thing. can i straight pipe past it and disconnect that O2 sensor or is that going to give me more problems? im just trying to restore some MPGs without breaking my wallet. ya dig?
 

agr99

Member
:
1999 mazda protege
Search non-fouler trick, it gets rid of p0421 and its cheap

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