A couple days ago I thought I'd check my O2 sensor since it looked old. It was all covered with thick black stuff. Luckily I had some STP air intake cleaner layin around. Cleaned thestuff off like it was nothing.

 

I pulled out the o2 sensor and it was all black no oil on it or anything. Sprayed some electric cleaner on there and it seems like it took some of the blackness away. Are they supposed to be like a chrome color or something when they are clean?

 

For those of you who cleaned them, did it help your MPG any?

 

ok yall, i looked under and i saw two, one upstream and one down. i didnt look much at the one upstream but the one down kinda had a hex style bottom, for a wrench i presumed. are they gunna be a real bit** to get out? i tried but i didnt want to break it then have to pay $300. what can i spray to loosen it or whats your guys' method? and for you guys that cleaned them, did you noptice anything different in your mpg? thanks a lot guys! ha, heard this thing 'bout fords. Fix Or Repair Daily

 

well for me, there was white plastic i think, and it was like a cage to the actual sensor.

I'm fillin up a fresh tank tommorrow. I'll tell you how it went til the next fill-up.