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code 33 is for the exhaust gas sensor (also known as the O2 sensor) if the computer is coding a 33 it does need to be changed. You can also uplug the sensor at the connector and if the truck runs better that's a good indication that the sensor is bad. The connector is on the passanger side fender wall with about 3 other connectors and it is on the bottom of the group with 3 wires running to the sensor.

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Q: If a 95 Nissan Pathfinder loses power on ascent and the computer diagnostic shows a 33 code does the oxygen sensor need to be changed?
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