Mechanics

MERCURY MOUNTAINEER SENSOR PROBLEM

2005 Mercury Mountaineer • 140,000 miles

Where is location of bank 1, sensor 1 o2 sensor?
auto zone said there test readings show dem p2195, should I change sensor and where is it. Passenger side or drivers side? I have a 6 cyl
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Johnrobitaille
April 10, 2013.



That is the upstream sensor on the passenger side but a new sensor isn't necessarily going to fix it. It's indicating a lean condition on that side of the engine, not necessarily a bad sensor. It needs to be diagnosed properly and the sensor tested.

Wrenchtech
Apr 10, 2013.