Ford - Mountaineer :: 1997 - O2 Sensor Replacement?


Jan 28, 2013

I have an 1997 Mountaineer AWD with the 5.0. The vehicle has 235,000 miles on it and has run great all this time. Early in the month the Check Eng light came on, I check the code and got "P0141 O2 Sensor Heater circuit Bank 1 Sensor 2". I check and found out it is the O2 sensor behind the Cat that is bad.

I have never change any O2 sensor on this vehicle since I have got it brand New. I have changed the oil every 5000 miles and flushed out the trans every 50,000 miles. New plugs and wires at 100,000 miles. I take good care of my vehicle as best as I can.

My Questions are, should I go ahead and change all the O2 sensor's? Which brings me to ask. How many O2 sensors does this vehicle have and where? Could it be something else causing the check eng light to come on? How bad is it to change all the O2 sensors out?

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This is a pic of my 99 with new TPS installed : [URL] .....

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NewOldTPS.jpg?t=1269362105

By the way, the original TPS was working fine so I have no idea what the symptoms of a bad TPS are. Since it was available I replaced it to have a spare and to see if this one would work. Both Pete and I thought it would and we were right.

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