Hello My Lex fame! I've had this cel on for a while now and have tried everything I could think of. It's code 25 which indeed I would have guessed o2 like everyone else. Well, I've replaced them both which wasn't cheap & reset the ecu,came up with the same thing. Cleaned egr thinking it might help but same thing. The last thing I've thought of is this plug in the back which I haven't had plugged up after a rear main seal job I did & can't remember where it goes if it goes anywhere at all (could be a dummy, I doubt it) Well here's the plug. Located off the harness near the lower intake manifold by the firewall.




Not sure where It's goes and or would it affect my ecm still throwing this code. BTW 92 sc300 only mod if a AEM intake. This pic is from my spare motor. (cut harness)
Input would be appreciate it. And comments on what to do to fix this cel problem would be great as well.

-Cheers

 

Nobody huh? Now brethren,how do we grow without unity? Can anyone identify this sensor plug?