Smooth idle unless a/c is running or load applied. Then it runs rough almost like timing is out.. Created by martin-marvich. Cars & Trucks - Geo - Prizm - 1994 Geo Prizm

What does a Diagnostic Trouble Code 431 indicate?

March 2021 1 36 Report

What does a Diagnostic Trouble Code 431 indicate?

Smooth idle unless a/c is running or load applied. Then it runs rough almost like timing is out.

Cars & Trucks - Geo - Prizm - 1994 Geo Prizm

Hi Martin,here's a link to your code. P0431 Warm Up Catalyst Efficiency Below Threshold Bank 2

I have seen many posts with 2 digit DTC's for my vehicle and the expert confirmed this. I sure hope yours isn't correct it sounds aweful. lol

hi Martin,your expert is wrong my friend,I am the expert my friend,just trying to help,you will see I am right when you have it repaired,good luck.