I got a P0420 code meaning I had a bad catalytic converter

Asked by GuruDWDF8C Apr 22, 2024 at 12:05 AM about the 2004 Toyota Camry Solara

Question type: Maintenance & Repair

I have a 2004 Toyota Solara 2.4L 4 cylinder. (Currently:179k miles)
Months ago I got a P0420 code meaning I had a bad catalytic converter,
how do I reset it to pass smog?

5 Answers

310,255

Was the catalyst replaced? If not then a reset won’t work.

1 people found this helpful.
2,315

Google P0420 fix. Companies sell spacers for the downstream O2 sensor. I pulls the sensor out of the exhaust stream and fools the computer into think the cat is good. The use a scanner to clear the codes. The smog test won't pass if all the monitors are not set. You need to run drive cycles to set all monitors.

310,255

Those spacers don’t always work. Sometimes they cause drivability issues.

157,615

Tampering with the emissions systems is illegal. Adding spacers is considered tampering. The only way to fix a P0420 code is to replace the catalytic converter. However you must know what emission control system you have. Is it California emissions, Federal emissions, northeastern region emissions, etc.? The emissions decal under the hood will tell you. Replacing the catalytic converter with the wrong one will only cause the P0420 to come back. Another thing to keep in mind, especially considering the age of the vehicle, is usually something else causes the catalytic converter to fail. Misfiring, the number one cause of catalytic converter failure, or burning oil, or coolant leaking inside of the engine. Before you spend the money to replace the catalytic converter, make sure everything is good with the engine. Jim

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