O2 sensor removal
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Freshman User
Joined: May 2012
Posts: 28
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From: Pensacola, Fl
O2 sensor removal
Any tips for this? Have socket, PB Blaster to soak that thing in.. Looks like it hasn't been removed since birth so should be an adventure. Might get a BFW to assist with the process. Anything else? Heading down to the hobby shop here on base Monday (when i'm off) doing brake job, tune up and what not. (Lifts are great) So got a few days to try different things. Thanks folks. Your guys knowledge is appreciated.
Posting Guru
Joined: Apr 2002
Posts: 1,471
Likes: 3
From: Greenwood In. USA
When I changed mine on a 92 I no longer own I just fired it up for about 5 minutes and then used a open end wrench. came right out. I dont know if I was lucky, dumb or both.
It sounds like you are on the right track just make sure you dont contaminate the new sensor with PB or any anti-sease
Good luck
It sounds like you are on the right track just make sure you dont contaminate the new sensor with PB or any anti-sease
Good luck
New User
Joined: Mar 2008
Posts: 14
Likes: 0
From: Hardin County, KY
You have to remove the sensor when the exhaust is HOT. Get the truck up to temperature. Shut it off and then quickly get under there and remove it using your sensor tool. Don't spray PB Blaster on the hot parts because you might cause a fire and the gas can't be doing good things for your lungs. That's the only way it's ever worked for me.
Fleet Mechanic
Joined: Nov 2011
Posts: 1,823
Likes: 43
From: New York
I just went through this - pretty sure my '91 4.9 was still sporting the original sensor. After struggling with no progress (and partially rounding off the sensor), two things made the critical difference in finally getting it out.
1) Heat up the sensor bung with a torch. You want the surrounding metal to expand, not the sensor itself (although clearly some heat will transfer to it).
2) Use a 6-point box wrench - not the more common 12-point - my local Sears (Craftsman) had both. Using a wrench, you can just barely get the box end over the quick-connector and position it in place on the sensor. Get under the truck from the front feet first, and get your foot on the wrench, grab hold of something, and leg-press the wrench. Once it moves a little, position yourself 180 degrees and tighten the sensor back the same amount. Do this for the first couple rotations, as you're likely going to be ripping some of the threads out of the sensor and this will help to break them up. You'll still probably need to knock some threads out with a chisel, and then (ideally), chase the bung with the proper tool.
Hope this helps
1) Heat up the sensor bung with a torch. You want the surrounding metal to expand, not the sensor itself (although clearly some heat will transfer to it).
2) Use a 6-point box wrench - not the more common 12-point - my local Sears (Craftsman) had both. Using a wrench, you can just barely get the box end over the quick-connector and position it in place on the sensor. Get under the truck from the front feet first, and get your foot on the wrench, grab hold of something, and leg-press the wrench. Once it moves a little, position yourself 180 degrees and tighten the sensor back the same amount. Do this for the first couple rotations, as you're likely going to be ripping some of the threads out of the sensor and this will help to break them up. You'll still probably need to knock some threads out with a chisel, and then (ideally), chase the bung with the proper tool.
Hope this helps
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Freshman User
Joined: May 2012
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From: Pensacola, Fl
thanks folks, waited till i got off work so exhaust was hotter then the hinges on the gates of helll. then broke it loose. but in other news... rear tank threw up in my parking lot at work. lol... had 5 gallon bucket under her (bout a gallon overflow) such a pain lol..just re added to front tank and good to go.
Fleet Owner
Joined: Oct 2005
Posts: 20,780
Likes: 1,746
From: Kentucky
I never could get the original O2 sensor out on my old 1992 F350 4x4 w/5.8L engine. I used that excuse to justify the cost of shiny new Bassani 3" stainless y-pipe to the wife.
Sad to say I recently sold the truck. I still have the wife....
Sad to say I recently sold the truck. I still have the wife....
Fleet Owner
Joined: Oct 2005
Posts: 20,780
Likes: 1,746
From: Kentucky
thanks folks, waited till i got off work so exhaust was hotter then the hinges on the gates of helll. then broke it loose. but in other news... rear tank threw up in my parking lot at work. lol... had 5 gallon bucket under her (bout a gallon overflow) such a pain lol..just re added to front tank and good to go.
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Freshman User
Joined: May 2012
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From: Pensacola, Fl
Sorry to hear about the truck man, not sure how ya feel bout the wife lol.. 
I got mines out. Gonna talk to exhaust guy later down the line and run true duals. Got other things to fix prior to that though.
Yeah out the fill hole (Pressure from the 100 degrees outside, over full tank = Puking truck) lol... it's all good.
I got mines out. Gonna talk to exhaust guy later down the line and run true duals. Got other things to fix prior to that though. Yeah out the fill hole (Pressure from the 100 degrees outside, over full tank = Puking truck) lol... it's all good.
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Don't come cryin' to us because you sold the wrong one!!!!!
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I am kinda partial to the wife after 24 years of marriage. My hotrodder mentality has rubbed off quite well. Her DD is a 2006 Mustang GT w/300HP 3V 4.6L V8, 5-speed and leather interior. Nice ride with only 18k on the odometer.
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Joined: Jun 2013
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Any tips for this? Have socket, PB Blaster to soak that thing in.. Looks like it hasn't been removed since birth so should be an adventure. Might get a BFW to assist with the process. Anything else? Heading down to the hobby shop here on base Monday (when i'm off) doing brake job, tune up and what not. (Lifts are great) So got a few days to try different things. Thanks folks. Your guys knowledge is appreciated.
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