Replacing and oxygen (0 2) sensor

[mfayant]

If you're having a problem with your 'oxygen sensor' it shouldn't be too hard to replace. I did mine on my 91 explorer with a 93 engine.

the sensor should be under the passenger side, and under the engine. It will be just below where the exhaust pipe hooks up with the 'catalytic converter' . You'll need I belive a 3/4 inch wrench to take it out. It shouldn't be there to tight but be careful because there might be some rust on it because it goes into the exhaust system.

Once you have undone, find a long stick, and stick up through an engine hole to see where the plug is. The plug in should be at the back of the engine. That is why you use the stick to get and idea of where to reach. Find the wiring, and disconnect it and replace it with the new one.

Best to use car ramps to get underneath. Don't use jacks as a support system not unless you have some good blocks to support the explorer.

The 'oxygen sensor' doesn't have to really tight when you put it back in. Read the instructions if you do it yourself.

[scoutdog]

Originally Posted by mfayant

If you're having a problem with your 'oxygen sensor' it shouldn't be too hard to replace. I did mine on my 91 explorer with a 93 engine.

the sensor should be under the passenger side, and under the engine. It will be just below where the exhaust pipe hooks up with the 'catalytic converter' . You'll need I belive a 3/4 inch wrench to take it out. It shouldn't be there to tight but be careful because there might be some rust on it because it goes into the exhaust system.

Once you have undone, find a long stick, and stick up through an engine hole to see where the plug is. The plug in should be at the back of the engine. That is why you use the stick to get and idea of where to reach. Find the wiring, and disconnect it and replace it with the new one.

Best to use car ramps to get underneath. Don't use jacks as a support system not unless you have some good blocks to support the explorer.

The 'oxygen sensor' doesn't have to really tight when you put it back in. Read the instructions if you do it yourself.

I just replaced mine last night and found that if you do put the vehicle up with a jack ONLY to dissconnect the wire harness on the front sensor it is a lot easier than trying to reach up from underneith. There is a straight shot to it from behind the passenger fron tire.However like you said don't get underneith without blocks or putting the tire back on and driving it up on ramps.

[mfayant]

forgot to mention, that the explorer has no catalytic converter in it. took it out and just replaced it with a regular exhaust pipe many years ago

m f