I have 1990 laredo
Need to know how to replace the oxygen sensor
thx

 

hmm, so do I, so I'll keep an eye on this myself

 

I would recommend a Wrench. Got to be one of the easiest sensors to change out.

Just get down there and take a look should be pretty self explanatory from there.

 

unscrew one, screw the other in? Do you need to seal the threads for any reason?

 

put some neverseaze on the new one to make it easier on yourself next time sometimes they are very hard to get out

 

Thanks will do

 

No.

The new sensor should come with some copper-based anti-seize, check before you leave the parts house. If it does not, tell them to get it out of another box (I haven't seen a sensor that didn't ship with the stuff in twenty years or so...)

The hex is 7/8" (standardised, they're also all an M18-1.5 thread...) and you can get an "Oxygen Sensor Socket" - which is an extra-deep 7/8" socket with a slot milled in the side to clear the wiring.

The socket makes the job easier. Remove the sensor when warm, as it comes out easier that way.

 

Yeah, my husband checked and it has the anti-sieze. Thanks for the hex size. Do you need to disconnect the battery?

 

On RENIX? No. You can if you want to make sure you're perfectly safe (OK - as safe as you can get. Mechanical work is inherently dangerous at some level - metal is harder than you are...) but there are no high-current leads or signals in that area, and you don't have to wait for the ECU to "relearn" that it has a new HEGO. RENIX adapts from programme everytime it starts running anyhow.

 

Thanks great to know

 

Does that mean if I buy a header that does not have O2 threads, that I can just unplug them and be fine? Has anyone else encountered this?

 

Welcome to the forum! You have just revived a six year old post!lol. Good rule of thumb is to check the date and if it's old, start a new post. Now on to your question. In order to answer accurately you need to provide your Jeep info, year, trim level, engine type etc. There are a couple of variants on exhaust, some with 4 O2 sensors and some with 2. You can't leave them unplugged, your engine will not run well without the data from the sensors. You need to buy a header designed for your year. Post up your details and folks will dial you in...

 

Ha! I guess that would help, huh? I asked this question in a different thread (that you and cruiser replied to) and basically got the info I was looking for, but its a 90 laredo 4.0 4x4, only one O2 sensor above the downpipe flange. sorry I didnt realize there was a statute of limitation on threads. I just thought everyone got tired of answering O2 questions.....back in 2008

 

LOL, nobody ever gets tired of O2 questions! I wonder if you could just swap in a later model down pipe with the bung for the O2 sensor further down? The fitting moved down I believe in 91.

 

right, so either try to order the correct year and return the current one or try to get a downpipe that has the spot for the sensor. choices choices!