Question about 2000 Nissan Pathfinder
There are 4 O2 sensors....the important ones for managing your mileage...they determine how much fuel to send to the cylinders based on a predetermined ratio for proper combustion. They're located by the exhaust manifold and are more involved for removal...recommend a professional for those.
The other 2, are located underneath the chassis, on either side of the drive shaft and are screwed into each of the exhaust pipes prior to the catalytic converter. You'll need a slotted socket wrench which is available at any auto parts store. You'll remove the sensor fairly easily. Note the color of the cable, as you'll replace white, (right side) with white, and red, (left side) with red. On top of the engine on the right side, you'll see the same colored cables plugged into their respective ports. Remove one first and replace it before the other so as to avoid confusing which port goes to which plug. The cables are secured by means of a clip that you'll need to carefully pop loose with a flathead screwdriver. After replacing the plugs underneath, drop a flexible wire, such as a 12ga. solid core wire about 6' long along the firewall following the path used by the original sensor's respective wire and secure the new replacement wire to it and pull up gently. Once plugged in, you can secure the new wire, using a plastic wire tie, to the other wires there.
Posted on Oct 21, 2008
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Posted on Jan 02, 2017
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