Check Engine Light

Tiny
PARAINES
  • MEMBER
  • MAZDA PROTEGE
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?
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Thursday, March 1st, 2007 AT 12:24 PM

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Tiny
CHEVYII
  • MEMBER
Hi
i would have the dealer look at it and narrow it down, a good tech will be able to test the 02 and find out whether you need the 02 or the converter, the code set states test the 02 in question and if its faulty if it is good replace the 3 way cat converter

jim

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Thursday, March 1st, 2007 AT 5:58 PM

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