The error code should tell you which bank and sensor you are looking for. with that information:
bank one on a montero sport is on the passengers side.
bank
two is the drivers side.
sensor one is before the converter,
sensor
two is after the converter.
each bank has two sensors. on each
bank there is a sensor with a black and a gray connector, and no they
will not interchange. connectors are different.
besides
disconnect the actual o2 sensor, you can just disconnect the plug to be
sure you got the right one. the plugs are hidden in the sides, just
follow the cables. you could disconnect the plug of the one that you
thing is the wrong one and check again the error code to see if you are
getting the same error. if you are getting a different one, then you
disconnected the wrong one.
good luck with the change. some wd40
or liquid wrench will help with the removal of the sensor.
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