Will WD-40 damage my O2 sensors? I used some to get the old ones out and I think a little of it got on the new ones. I keep getting the SES light. It mostly happens when driving and I let the engine get really warm. I'm really hoping that maybe it'll burn off and everything will be fine???

 

What code are you getting? I seriously doubt that small amount of WD40 left over from removing the O2 sensor would hurt anything. It is basicly light oil.

 

I haven't had the codes scanned yet. Hopefully I can get it done tonight. It just seemed too strange to me that after I put in new o2 sensors I start getting SES...

 

Why did you replace the O2 sensor? An old O2 sensor may mask and issue a new one could pick up. The perfect example would be the O2 sensor after the Cat. A new one of those can turn on a SES light real fast.

 

Well it's an interesting story, but long story short, I replaced them because my car was acting up, and I took it to a mechanic, and he said mine were bad, so I ordered some new ones. But while I was waiting for them to arrive, I found a vacuum leak and that fixed the problems I was having.

But then the new o2 sensors got here and I had been reading stuff online that said they're supposed to be replaced after about 30,000 or so miles anyway. So I did. The car still runs fine. There's nothing out of the ordinary that I notice at all. Just the SES light.

Also, my car is a 1995; it doesn't have after cat sensors.

 

best to find out what the code is. what brand of 02 sensors.

 

They're ACDelco sensors

 

probly not the 02 sensor. oil will burn off in the long term. i have used a acetylene torch to clean 02s before and it works to get the fouling off.

 

Well I just changed the sensors yesterday so it hasn't been that long. The light came on when the car got really hot like if i let it idle for a while in a parking lot and then punch it, the light would come on, but as the car cooled down it would go off.

It also came on a few times while I was driving but when I turn the car off and start it back up the light is off and it stays off for a while.

I was thinking that maybe the WD-40 was causing the sensor to get a bad reading or something and maybe this would throw the SES light until it all burned off and then everything would be fine.