1999 Dodge RAM with engine code P0420

Question

I have a 1999 Dodge RAM and I got an engine light on I scanned and came up p0420 so I replace the oxygen sensor the downstream one and didn't fix it so that means I have a bad converter or should I replace the upstream oxygen sensor

Answer 1

Unfortunately, you must replace the catalytic converter. Although replacing the sensor may temporally fix the problem, eventually it may be the catalytic converter.

P0420 Dodge Code - Catalyst System Efficiency Bank 1
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