Senior Member
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Join Date: Dec 2015
Location: Colorado
Posts: 1,181
Real Name: Ron
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Senior Member
Join Date: Dec 2015
Location: Colorado
Posts: 1,181
Real Name: Ron
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I changed both on the driver's side a year ago. As said, the rear O2 sensor is accessible from under the truck. Might want to drive it up on ramps for easier access.
Best way to get to the front AFR sensor is through the wheel well. Put the front of the truck on secure jack stands and remove the wheel; that will make the job a lot easier. An O2 sensor wrench helps - I used a crow's foot wrench that also worked well.
The hardest part on the front sensor for me was figuring out how to activate the connector release. It's hard to see the tab you need to press, and to get your hand in there in such a way so as to apply adequate force.
I did not have to use penetrating oil and had no trouble breaking them loose, but my truck has essentially no rust underneath.
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2006 Sport Edition, V8, 206K miles, 2.5/1.5" OME lift, SPC adjustable UCA's, 255/75/17 BFG KO2's load range C @ 40psi. Regeared diffs to 4.30, with TrueTrac in rear.
1994 SR5, V6, 5-spd, Aussie locker front, Aisin manual hubs, Truetrac rear, 33/10.50/15 BFG KO's, stock suspension, OBA (Viair 400C), Front Range Offroad twin stick, 225K miles. Dual 2.28 transfer cases, for a 90:1 crawl ratio.
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