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Old March 8th, 2011, 02:37 PM
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Trenton Smith
1997 D90
Join Date: Sep 2009
Location: Kerrville, Texas, USA
Posts: 84
O2 sensor question

Quick question I couldn't find by searching,

Where are the front O2 sensors on the '97 4.0L and how long does it take to change them?


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Old March 8th, 2011, 02:47 PM
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1983 110 200tdi 3 door soft top
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Location: Fords, NJ
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in general terms, you will have one in front and one behind the cats on 96 and up vehicles

Use a offset 21mm 02 plug socket and some heat to remove them.

the harbor freight one is cheap and works fine


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Old March 8th, 2011, 02:56 PM
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Daniel Chapman
1999 D1
Join Date: May 2004
Location: VA
Posts: 762
Sometimes it's a 15-minute job, other times it takes 2-days.
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Old March 8th, 2011, 03:25 PM
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I have never seen a rover in person
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Location: on the internet
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Whatever you use, make sure it is 6 point and spray the crap out of them with your pentrating lubricant of choice before hand. I put anti-sieze on the threads when I reinstall.

If you know they are junk, my best luck has been cutting the wires and using a proper 6 point deep socket and a breaker bar to get them out.
*not legal advice*
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Old March 8th, 2011, 03:33 PM
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Tom Rowe
Join Date: Feb 2006
Location: Atlanta, GA USA
Posts: 1,287
For the senors, Amazon used to be the cheapest place to get them, but now it looks like it's:
http://www.autopartsdealer.com/ntk_o..._content=rank1 if you don't AELS. Free shipping too.

If you have AELS then the same place is cheaper than Amazon by a few cents, but no free shipping:
Tom Rowe
Atlanta, GA

Four wheel drive allows you to get stuck
in places even more inaccessible.

62 88 Regular
67 109 6cyl NADA x2
74 Lightweight - The Antichrist
95 DI 5-speed
95 D90 5-speed
97 D1 Automatic
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