O2 sensors please help!!!!

[xmodster3o3]

Yes I have over 170,000 miles on my stock O2 sensors. I been meaning to replace them but where can I find them.
1991 Ford Explorer
Thank you for your help.

 

[DeRocha]

They are located in the exhaust pipe before the catalytic converters. Some early models only had 1, but my '93 had 2 (one for left/right). The sensors will have a few wires comming out of them and attaching to the wiring harness at the back of the engine (access through wheel well to disconnect them).

 

[ipozestu]

If your not having any problems with them don't replace them. When they go bad they will throw a code.

 

[xmodster3o3]

Thanx for the info guys, the reason i'm changing them is because I have been getting bad gas mileage lately and people have said to try changing the o2 sensors.

 

[DeRocha]

I would change them...They tend to get "lazy" as they age. This results in poor gas mileage.. The sensor (if you have it) on the passenger side will require a special o2 socket (autozone rental). You only need the socket because of the cramped space. The driver's side comers off with a few adjustable wrench.

 

[MrShorty]

Your '91 should have only one O2 sensor. My '92 only has one. Just upstream from the catalytic converter where the Y pipe comes togehter. I think '93 was the first year for two.
One little trick, I find it easiest to get to the connector through the wheel well (just like getting to the #3 spark plug).

 

[xmodster3o3]

Hey thanks for the help guys, I plan to change them or it this weekend, i'm sure I only got one for I got the explorer the first month out in the market.