jamesdal7

OK, I need to replace my oxygen sensors, the two that are pre catalytic, I can easlly reach them with my hand, but when I put my Wrench, i can not turn it, what do i need?

jamesdal7

Here's what im working with

lukemoore646

if you are posative that you have the correct ones cut the wires and put the boxed end of a 7/8 wrench on the head, sometimes they can be tight and sometimes they tear the threads out of the pipe, hope this doesnt happen to you

jamesdal7

I went and got the special socket tool to remove, but still have little room to remove. These are pre catalytic, not the post catalytic. those were easy. The pre catalytic are still too tight. is there a way for me to remove them? Do I have to heat them up?

jiggsy

For what it's worth...
Run the truck until it reaches normal operating temperatures. It'll heat up the pipe and the fitting, then try to remove them again. I'm with lukemore646, cut the wires and put the box end of the wrench on it and pull. You can always re-thread the fitting and put in a helicoil if it strips it out.

Good luck

jamesdal7

Wow, after a couple of days, I finally got them off. I put some WD40, the night before and yesterday. I did warm up the truck a little. I put on a long sleeve and gloves to keep from burning myself. I was able to get them off.

As I was putting them back together, passenger side was easy, but the driver side was a b**ch. I couldn't get my hands through to disconnect the electrical piece. It sits on the top side of the frame. But before you can get to it, u have to pass the exhaust pipe, frame, gas lines, etc etc to just get to the electrical piece. Finally I was able to jam my hand in there and pull it out by force. Putting it back was another struggle. I even thought about taking off the exhaust pipe to put my hands through just to connect the things, ugh! but it's all good now.

98white5.0

O2 sensors have always been a pain for me, until I got this 98 of mine. Heck, on my 91 dually, I torqued down on them suckers and half the exhaust pipe came off in my hand! Needless to say, I got a nice (sounding and looking) exhaust.