Engine check light on
My engine check light is on and a scan give me P0420 how do I solve it. I have already changed my catalytic converter
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@juniordavi97786 the P0420 can also be tripped because of faulty oxygen sensors, and even exhaust leaks. On high mileage engine that seem to burn a bit more oil, that may coat the downstream O2 sensor and can give that error code. So, check for exhaust leaks and consider replacing the downstream O2 sensor.
Let us know the exact engine size and year of your vehicle so we can try and dig a bit deeper, if we have to.
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