Acura P0420 Error Code: How to Fix It

Q: Can I drive with Acura P0420 error code?

Yes, you can typically drive with P0420 code as it's not an immediate safety concern, but you should address it soon. The catalytic converter isn't working efficiently, which increases emissions and may cause you to fail an emissions test.

Q: How much does it cost to fix Acura P0420 error?

Repair costs vary widely depending on the cause. Oxygen sensor replacement typically costs $200-400, while catalytic converter replacement can range from $800-2000 depending on your specific Acura model and whether you choose OEM or aftermarket parts.

Q: What causes P0420 code in Acura vehicles?

Common causes include failed oxygen sensors, a worn-out catalytic converter, engine misfires, exhaust leaks, or contaminated engine oil. On Acura V6 models like the TL and MDX, oxygen sensor failure is often the primary culprit.

Q: Will P0420 code clear itself on Acura?

No, P0420 will not clear itself. The code will remain until the underlying issue is fixed and the codes are manually cleared with an OBD2 scanner. The check engine light will stay on until repairs are completed.

Abstract

Acura error code P0420 indicates that your catalytic converter's efficiency has dropped below the threshold on Bank 1 of your engine. This is a common issue on Acura TL and MDX V6 models that can be caused by a failing catalytic converter, oxygen sensors, or engine performance problems.