Replacing O2 sensor on '98 - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 06-06-2012
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Replacing O2 sensor on '98

Hello all, long time no see. I've got an O2 sensor that needs replacing on my '98, and I need to do it myself, seeing as I am far too poor to have a mechanic do it for me. I have a bit of a problem. First, If I remember correctly there is more then one O2 sensor. Two banks of them, I believe? I remember when my issue was diagnosed I was told the problem was in bank one. I know I could just be completely remembering this wrong, but if theres more than one sensor per bank, how would I go about figuring out which one is the culprit?

Second, I've been given a few rundowns on the procedure for accomplishing this task, but would anybody happen to know of any guides or offer any advice on this? I would really appreciate it, and thanks for helping out an ignorant man who needs this to get done. :P
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Old 06-06-2012
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The truck has 3 o2's you need to replace the 2 closest to the engine for monitoring the air/fuel ratio. These should be replaced when you change the plugs every 100k.

They are in a tight spots but simple to change, make sure you get a O2 socket or 7/8 flare nut wrench otherwise you may strip them when you try and take them off.
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Old 06-06-2012
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If you look up the specific code it will tell you which bank and sensor is malfunctioning (bank 1 is on the same side as cylinder 1).

Before you try removing it I'd run the engine until the sensor is warm (hot to touch) and give it a good shot of penetrant oil. Keep it soaking it as it cools and let it sit over night.
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Old 08-31-2012
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Sorry for late reply, life gets me caught up way too easily.

I had the code checked again, and I was told it was bank one, sensor one. My engine is a 2.5L I4, where would this be located?
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