djspawn00

Hi, I've been missing from these forums for quite some time. I see a lot of post and questions regarding P0125. I had this issue for quite some time. I replaced the ECT sensor at first thinking it was a simple fix. 7 miles later it came back on. I read up on here that an issue may be related to an o2 sensor. I replaced both precat sensors with Denso sensors from rockauto. While swapping them out I made it a point to examine the wires as another member on her recommended. Sure enough there was a break in the wire. It never caused a code to be thrown for anything o2 sensor related but sure enough it was causing the P0125 code to pop up. If you don't have access to indentifix or similar databases I hope this can be useful. The broken wire is picture below. It's the harness close to the firewall. I removed part of the intake for easier access. Fixed the wire with a pick and some solder. 120 miles later no CEL.

Roop10

Good lookin' out, i'll have to check this before i order Air/Fuel ratio sensor, thanks!

bruceb58

This why it is helpful to have a scanner that plots out the O2 sensor voltage.