I'm glad someone brought my old thread back, as I do have a small update. The light stayed off for 2 months. It came back on the other day, so I reset it. One week later, the yellow light made its appearance once again. Reset it, and the next day it came back. So far, it hasnt come back on in about a 1/2 week. I'll try to replace the sensor when I can, and I will let you know what happens afterwards. Been real weird with this light... I don't know if it matters or not, but it only came on when it was really wet outside, or it was raining currently.

 

It sounds like you have either a dirty or corroded connection in your wiring or an open circuit. I would look at the connections to your Oxy sensors and clean them up, add a little di-electric grease to the connection, and plug them back together. It could be a lot of things like the guys have talked about previously in addition to this but because it is doing it when wet and it is inexpensive to work on, I would do it. If it doesn't fix it at least you have eliminated it as a possible source of the problem.

 

Im sure my dad has some around the shop, so maybe I can do something tomorrow. I have thought it may be something like that, but hearing it from another person is reassuring. This week does look a bit busy for me, so who knows when I can. Thanks again, hopefully I can get this figured out. By the by... you dont think this could affect MPG, could it?

 

It will affect the MPG. If the wiring is not allowing the Oxy sensor to send accurate information to the computer, the computer (PCM) does not know the correct fuel air mixture to deliver to the engine thus affecting MPG. My brother in law told me he wasn't going to change out his bad Oxy sensor because his car ran fine as is. He placed black tape over the check engine light and kept on driving for the next 5 years he owned the car. I even offered to help him change it if he bought the part (which would have been $30) but he was too proud of the smart way he was saving money on auto repair. He spent the $100 it would have cost for the repair at the dealer on gasoline many times over.

 

Geez... That may explain the 14 mpg i am averaging, and the small drop that occurred last time. im going to check it again after this fill up i just did. See what happens.