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post #1 of 7 (permalink) Old 12-08-2014, 08:04 AM Thread Starter
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o2 sensors failed.

Hey everyone in new here just wanted to share and see if it happened to anyone else. I was driving home from work and my 4.7 spat out my manifold drivers side o2 sensor. Just spit it right out. Diagnosed it as a failed gasket and an still replacing it. Trick has 108000 miles.
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post #2 of 7 (permalink) Old 12-08-2014, 08:12 AM
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Re: o2 sensors failed.

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Originally Posted by Rockieshawk View Post
Hey everyone in new here just wanted to share and see if it happened to anyone else. I was driving home from work and my 4.7 spat out my manifold drivers side o2 sensor. Just spit it right out. Diagnosed it as a failed gasket and an still replacing it. Trick has 108000 miles.
Not sure how a failed gasket would be involved. No gasket save the metal o-ring on the 02 and the manifold 02 sensors are threaded into the header itself. The threads on either the sensor or the manifold 02 bung would have had to have failed in order for it to have been "spat out". Pics?

355,164 miles on the odometer [come see me when you get that on your ford]



2004 Tundra Double Cab Limited Edition 4.7 liter V8, four speed automatic, four wheel drive, testing platform for fuel economy, Ultragauge, Long Tubes with x-pipe and true duals,stock intake, Mobile 1 in the engine, NAPA oil filter, NAPA [COLOR=Black]in the differentials. 3:91 gears in the front and rear [SIZE=2]differentials, Cooper Discover ATP tires


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post #3 of 7 (permalink) Old 12-08-2014, 07:11 PM Thread Starter
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We couldn't visually see what was wrong with it and assumed it came with the milage. Already bought the gaskets which are a better material in general. Main problem ended up whoever replaced the o2 sensor before the truck was mine put the o2 sensor on wrong. They f'd the threads pretty good on the manifold. Did a budget fix by welding a new nut to the manifold that fit a spare sensor I got with the truck. The threading was too far gone to retap. It did just spit out the sensor after all
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post #4 of 7 (permalink) Old 12-09-2014, 09:26 PM
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Re: o2 sensors failed.

Quote:
Originally Posted by Rockieshawk View Post
We couldn't visually see what was wrong with it and assumed it came with the milage. Already bought the gaskets which are a better material in general. Main problem ended up whoever replaced the o2 sensor before the truck was mine put the o2 sensor on wrong. They f'd the threads pretty good on the manifold. Did a budget fix by welding a new nut to the manifold that fit a spare sensor I got with the truck. The threading was too far gone to retap. It did just spit out the sensor after all
The problem with the threads was probably not a botched repair. The old nuts rust away to nothing and then the O2 sensor falls out. The threads on the stud are then full of rust from the vanished nut and the only way to clean the threads is by running a die down the stud.

The studs are replaceable - P/N 90116-08168.
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post #5 of 7 (permalink) Old 12-15-2014, 12:31 AM
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Re: o2 sensors failed.

itchin' to roll up'n under mine to see/change two... story later...

2002 Tundra SR5 4.7L 2WD
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In progress...
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post #6 of 7 (permalink) Old 03-12-2018, 07:58 PM
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Re: o2 sensors failed.

O2 sensor story MUCH later... Bought them on amazon right after I made the last post a few years back. Had a garage put them on recently and no codes for a few days. Get CE light and think the threads were not retapped on removal and need to do that look/see routine myself after I get moved to TX here in about a week. I can reset the codes and it stays off for a few days now...story later(hope soon, not like last time)

2002 Tundra SR5 4.7L 2WD
253000 plus miles
In progress...
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post #7 of 7 (permalink) Old 09-05-2018, 01:01 AM
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Re: o2 sensors failed.

Great Post !!
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