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I have a 1997 mountaineer. There are 2 sensors on the passenger side and 2 more on the right. Crawl under your rig on the passenger side and you will see them mounted on the exhaust pipe near the catalytic converter. The exhaust on my truck has two exhaust pipes leading from the engine and they are both set up pretty much the same. locate both sensors (they are mounted on the top of the pipe) and change the one that is indicated as failing on the OBD II read. Bank one is the one closest to the engine and bank 2 is the one farther from the engine. Remember to disconnect the wire first when disconnecting and when you install, put the sensor into the pipe and then connect the wire to the harness as the final step. There is a special socket available to help with this job but I used a box wrench and it went pretty well. Hope this helps. Its the ONLY thing that comes off of the exhaust pipes with electrical wires attached. (EX. Bank 1 sensor 1 default would be the drivers side BEFORE the catalytic conv. Sensor 2 is after catalytic con. Bank 2 is passenger side -- just in case you need that info) Good luck and use lots of PB blaster
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