Nissan P0420 Error Code: How to Fix It

Q: What does Nissan P0420 error code mean?

P0420 means the catalytic converter efficiency is below threshold for Bank 1. This indicates the catalytic converter isn't properly cleaning exhaust gases, often requiring replacement of the converter or related oxygen sensors.

Q: Can I drive with P0420 code?

While you can drive short distances with P0420, it should be repaired promptly. The code indicates increased emissions, potential fuel economy loss, and will cause failure of emissions testing in most states.

Q: How much does it cost to fix P0420?

Repair costs range from $200-400 for oxygen sensor replacement to $1000-1500 for catalytic converter replacement. Diagnosis typically costs $100-150 at a shop.

Q: What causes P0420 code in Nissan?

Common causes include failed catalytic converter, faulty oxygen sensors, exhaust leaks, engine misfires, or fuel system issues. The catalytic converter itself is the most frequent culprit requiring replacement.

Q: Will P0420 code clear itself?

P0420 will not clear itself if the underlying problem persists. The code may temporarily disappear after clearing with a scanner, but will return within a few drive cycles if the catalytic converter or oxygen sensors are still faulty.

Abstract

The P0420 error code in your Nissan indicates that the catalytic converter's efficiency has dropped below the minimum threshold for Bank 1. This means your catalytic converter isn't properly cleaning exhaust gases, which can lead to failed emissions tests and reduced fuel economy. While this code can be triggered by faulty oxygen sensors, exhaust leaks, or engine misfires, it most commonly requires catalytic converter replacement.