I have a 1989 Camaro TBI v8, and just need some clarity. I keep grabbing a code 25; and i live in CA. So i have been trying to get this puppy to pass smog and now that this code has popped it will immediately be failed. As you know, I'm sure. Anywho, I have been searching the forums and seaching on this code, and have found in the Haynes Repair manual that it is located " in the air cleaning housing". right there in black print. Yet... i search part stores and they are identical to the coolant sensor. if you pull it up on auto-zone, it even refers it to the coolant sensor. That is the part that confuses me just a tad. IS it the same? if it were the same, why would they sell it under a different name? or is there an identical sensor located elsewhere? Doesn't quite make sense to have the same sensor with two names. Thank you for your help.

 

Alright, so apparently after much research(mostly from this forum) i have found the solution to this problem. Apparently the IAT/MAT is the same as the "air charge sensor". At least.. according to my ECM. so i looked over some items over at the TBI section, and saw a few people had the air charge sensor on their cars aswell. So, after scratching my head at this SEL light, i decided to change it. but it even came on after i switched it out. I put my tester on the plug to make sure it was getting 5v. and it checked out. I cleared the code and took a drive. I noticed it would come on only after going a bit of a distance. Yet, would clear at Idle. I took it back home and inspected the sensor, and ran my hand down the wires. I then noticed there was a little cut on the yellow wire leading to the sensor. Apparently, it had rubbed against the EGR solenoid holding bracket. haha man do i feel stupid for that. So i repaired the wire and the code was gone.

I thought i would post this in case it may help anyone else out.