Help!!!
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Senior User
Joined: Nov 2008
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Help!!!
How many o2 sensors are there on my truck? I have been told one and I have been told two... I looked underneath my truck and was only able to find one.
The computer said the o2 sensor was malfunctioning so I replaced it and cleaned the connector. It still says the o2 sensor is bad even after codes were cleared. BTW this is the second o2 sensor. It sucks becuase I am getting about 5mpg.
The computer said the o2 sensor was malfunctioning so I replaced it and cleaned the connector. It still says the o2 sensor is bad even after codes were cleared. BTW this is the second o2 sensor. It sucks becuase I am getting about 5mpg.
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Joined: Sep 2007
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From: Iowa
Your truck, being a 95, is OBD I and should only have one O2 sensor, mounted ahead of the catalytic converter. In 96, all vehicles using OBD II use 2 sensors, one pre and one post converter (some with up to 4 total depending on the converter configuration).
A thought..since this is the 2nd O2 sensor you have tried...you aren't using universal "splice" style O2's are you (your post said you cleaned the connector so guessing no) or have a melted, broken, etc wire lead to it or bad connector do you?
While it is possible to get 2 bad new O2's, it is very unlikely depending on brand you are using. I would look for other reasons it is still showing a trouble code like some of the ideas I mentioned above.
A thought..since this is the 2nd O2 sensor you have tried...you aren't using universal "splice" style O2's are you (your post said you cleaned the connector so guessing no) or have a melted, broken, etc wire lead to it or bad connector do you?
While it is possible to get 2 bad new O2's, it is very unlikely depending on brand you are using. I would look for other reasons it is still showing a trouble code like some of the ideas I mentioned above.
Last edited by mstngmikegt; Jan 6, 2009 at 12:53 PM. Reason: typo fix
Senior User
Joined: Sep 2007
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From: Iowa
Agreed, won't say O2 sensor bad. But the reading is probably O2 sensor always lean, computer then will try to richen the mix to accomodate and cause fuel mileage drop. Agree too that alot of factors can play into that code and ultimately cause the poor mileage. I would also agree that I wouldn't jump to the conclusion that the computer is bad either. Concentrate on the basics...make sure they are right before dumping money into computers, etc on a guess. Believe me, I understand that it can be frustrating and easy to jump to conclusions, but it is more frustrating to spend big money on things like reman computers and still have the issue! I am curious too what brand O2 sensors you are using.
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I am using Bosch sensors. Today at car-quest pete asked if there is an air pump. I said I believe so and he said that a malfunctioning pump could cause this also. Is there any way to test this and also where is it located?
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From: Des Plaines, Illinois
You really should have one, just so you know where to find all these things on the truck. There is the chance the air pump isn't working, but you could have other problems like a bad FPR that's putting too much fuel through.
Bosch sensors are typically pretty good, so I'd assume there's a real problem with running rich...either a mechanical problem or for some reason the computer is never reaching closed loop.
Bosch sensors are typically pretty good, so I'd assume there's a real problem with running rich...either a mechanical problem or for some reason the computer is never reaching closed loop.
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Joined: May 2004
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From: Lakewood, Ohio
start with the basics and a manual is the most basic.
or, you are like a tailless dog chasing its tail.
maybe that bit of silliness will be more clear for you