Question about 2004 Mazda RX-8
Hello and welcome. the code P0420 is for a bad cat. converter. replacing 02 sensors wont repair this code. the code simply's means that thje cat. converter is not working as designed and will need to be replaced.
The PCM determines the oxygen storage capability of the catalytic converter has degraded below a calibrated threshold.
Posted on Jul 03, 2010
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Posted on Jan 02, 2017
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