Code p0240

160,000 MILES • 4.2L • 6 CYL • 4WD • AUTOMATIC
Avatar
DIGGOD1
  • MEMBER
  • 1 POST
replaced catalytic converter and both o2 sensor still have p0420.
Nov 4, 2021 at 2:37 AM
Advertisement
Avatar
JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Hi,

The code simply indicates the converter is no longer doing its job. Did you reset or clear the code? It should reset itself after three consecutive ignition cycles without a problem. Are there any other codes stored?

Since everything is new, we may need to confirm the sensors are working properly. There could be a wiring issue.

Take a look through this link. It explains what to test.

https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor

Let me know if you have a live data scanner and if there are any other codes stored.

Take care,

Joe
Nov 4, 2021 at 12:45 PM
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Frequently Asked Problems for This Vehicle