O2 Sensors
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O2 Sensors
I have a 1998 Ford Ranger. The check engine light came on and I had a tech from Auto Zone check it out. He informed that the code indicated that both the front and back O2 Sensors were bad and that each side had 2 sensors totalling four 02 Sensors. After looking for these sensors, I was only able to fine 3. Was the tech correct in telling me there were 4 or are there actually only 3? One of the 3 was toward the center of the exhaust pipe and the other two were located just after the y of each manifold.
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Joined: Jul 2003
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From: Alvin, Texas.
Are the sensors bad or are the sensors getting a bad reading from the air/fuel mixture?
That's why I don't care for Autozone's checking method.
Get us the code number(s) and let us know.
Also, the back sensors go bad very rarely...they check for exhaust flow, while the upstreams check for oxygen in the fuel mix.
Not much to go wrong, unless age and filth come into play!
That's why I don't care for Autozone's checking method.
Get us the code number(s) and let us know.
Also, the back sensors go bad very rarely...they check for exhaust flow, while the upstreams check for oxygen in the fuel mix.
Not much to go wrong, unless age and filth come into play!
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O2 Sensors
Not exactly sure what the codes were to be honest however the truck has 172K miles on it so the age factor may come into play. I replaced the two front sensors and had to reset the computer by pulling the battery cables off which seems to have corrected the problem at least for now. I tried the resetting before replacing the os sensors and check engine light went off for a few hours then came back on. Since replacing the sensors and then resetting, it has been 3 days now with no check engine light.
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Joined: May 2004
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hey tom let me know how this works out for you, because I just had the exact same thing happen to my 98 ford ranger v6...mine only has 80,000 miles on it so I don't think the O2 sensors are the problem...I am leaning towards the MAF......prolly needs cleaning!
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I changed the front O2 Sensors (one on the left side and the other on the right side) of the exhaust manifold. I got to them failry easy once I removed the front tires and went in through the fender wells. I reset the computer by removing the battery cable and since doing so my check engine light has not come back on. I seem to get a little better gas mileage as well. I would go to auto zone and have them put the decoder on to see what the codes says. With only 80K miles, you might have a different problem?
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80,000 can be alot depending on circumstances like if routine maintenance hasn't been done, alot of idling, alot of bad gas, etc. but you won't really know untill you get the codes.
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Joined: Jan 2005
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From: Englewood, CO
You really need the codes. I forget the code mine showed on a 96 4.0 w/ 90,000, but it told me the downstream sensor on the right side. Now since there is only one downstream sensor, and that is after the cat, it was a simple fix.
Last edited by rbengl; Jan 6, 2005 at 10:21 AM.
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