97 mazda protege. My check engine light came on again. I went to get and OBDII test and they gave me a code of P0420, saying it's either a O2 sensor or my catalytic converter. What is it more likely to be? If it's either one how much do they cost to get fix. Are the catalytic converters very expensive?
have the same problem?
Thursday, March 1st, 2007 AT 12:24 PM