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

 

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.

 

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.

 

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?