PO420 code HELP!
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PO420 code HELP!
I have replaced the 02 sensor (the one you can see between the radiator and motor) but my check engine light came back on. I got a PO420 code on it. It says Catalyst System Efficiency Below Threshold ( Bank 1 ). Am I going to have to replace the catalytic converter? And which one? This is on a 1997 ES 300.
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nicos1
ES - 1st to 4th Gen (1990-2006)
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10-08-07 12:44 PM