2003 Mitsubishi Galant Check engine light on Code:P0431

130,000 MILES • 6 CYL • FWD • AUTOMATIC
Avatar
FLEXTRON
  • MEMBER
  • 1 POST
Hi Guys,
My car was working fine when about a year ago, check engine light came on. I replaced the Bank 2 catalytic converter with an aftermarket one at an exhaust shop and the car worked fine. Never got the check engine light again. Now recently I got my fuel injectors cleaned at a shop and no major repair work. Suddenly after couple of months the light is on. I reset it and it comes back not before 3-4 weeks. My question is did the O2 sensors got burned partially in the process or is it the catalytic converter again? I doubt a catalytic converter can get bad so quickly.
Thanks in advance
Flextron
Nov 18, 2008 at 2:43 AM
Advertisement
Avatar
RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
The best way to tell if the Cat is a goner is put it up on a 5 gas analysis machine, as for the Snitchers could be not switching accordingly lock on the lean side and computer trying to compensate creating too much unburned fuel in the exhaust
Nov 18, 2008 at 3:09 AM
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