Oxygen sensor
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Freshman User
Joined: Feb 2002
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Oxygen sensor
I was in Autozone today and they had a display up about replacing the oxygen sensor. I have 108,000 miles on my '89 F150 and have never replaced it and am not getting any codes. Would this help my mileage and be good maintenence or am I wasting my money????????
Postmaster
Joined: Jul 1999
Posts: 3,172
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Oxygen sensor
The best way to check the O2 Sensor is by measuring its output signal . They set up displays like that not so much for the info but because it puts the idea in ones mind that maybe you do need to replace it . What engine does your truck have ? Whats your current Mpg ?
Postmaster
Joined: Jun 1999
Posts: 2,719
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From: Lee's Summit MO
Oxygen sensor
Neither of my trucks were showing any codes when I replaced them and I know it helped. If you want have them tested, take it off and have autozone test it. They can tell you for sure if you need to replace it.
They go out at around 65k.
'93 F-150 loaded and modified!
Check my Gallery
They go out at around 65k.
'93 F-150 loaded and modified!
Check my Gallery
Posting Guru
Joined: Feb 2000
Posts: 1,100
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From: Wichita USA
Oxygen sensor
I have an 89 with 140,000. Have tested O2 several times with lab scope and it has always been working just fine. Think I will leave it alone. These sensors can start reading slower than normal and still not set a code or cause drivability problems though. If this happens you can notice an improvement in mpg by changing it.
Postmaster
Joined: Jul 1999
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Oxygen sensor
Bull , Where are you getting the 60K mile service interval ? In a properly running engine an O2 Sensor will last well beyond 60K miles . I have to agree with Nitro , Replacing any sensor before it fails is a waste of time & money .
Freshman User
Joined: Jan 2002
Posts: 44
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From: Olathe usa
Oxygen sensor
i am getting terrible gas milage on my truck ( 8-9 ) on a remanufactured O'reillys 302. i was lookin around it the other day and on the pass. side exhaust manifold there is a plug with 3 wires coming out of it. i think this is an 02 sensor. but anyway, the wires are cut about and inch up from the sensor, and no other wires in sight. is this hurting anything? could it be causing my bad milage? thanx in advance
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Postmaster
Joined: Jun 1999
Posts: 2,719
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From: Lee's Summit MO
Oxygen sensor
That sensor should have two white wires and a black one.
It is a bad thing if they are cut. However the o2 sensor works in open mode, which is operating temp. It makes no difference in closed loop or code mode.
'93 F-150 loaded and modified!
Check my Gallery
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Senior User
Joined: Feb 2002
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From: ct
Oxygen sensor
if its not broken then leave it alone. theres no 60,000mi rule. i see cars every day at the shop with well over 100,000mi and the original hego sensors switch just fine. if theres no reason to condemn it then leave it alone.