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2004 RX330 - Code P0420


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This morning both by check engine and VSC lights came on. I took the car to Autozone and the tester said that P0420 code appeared twice.

He sold me a bottle of Cataclean and told me to try that first.

Any chance that will work? Should I reset the lights after using Cataclean or should it go off on its own? How do I reset the lights (remove power to the battery for a few hours or is there an easier way)?

Am I safe driving the car around in the meantime?

Any other suggestions? Anything else it could be or is that code pretty definitive as to what the issue is?

Thanks in advance!

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Visually inspect the exhaust system for leaks, check the catalytic converter for dents, holes, severe discoloration, and check for a rattle inside. If any of those syptoms are there, the converter likely needs replacement. Then, visually inspect the downstream O2 sensor (behind the converter). Check for broken wires, obvious faults, etc. If all that checks out, you'll probably want to replace the O2 sensor. The light will probably not go out on its own, you'll need to reset it. If you don't have the equipment to do this yourself, take it back to Autozone. Their reader can also reset it. If the problem still exists, it will come back on, sometimes after about two or three engine warmup cycles.

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