Originally Posted by Kyle2000Ranger
My truck has been throwing 02 sensor codes. I replaced the front 2 before the cat a couple of days ago. And now i am getting 2 codes, PO135 and PO155. Where do the 02 sensors get their power? What fuse? Help meeeeee
Fuse 13 (15A) in the Power Distribution Box under hood supplies power to the O2 sensors.
To check for power at the sensor use a voltmeter set to read 12V. Pull the connector to the O2 sensor and connect the red probe to the connector terminal with the Blue with Orange stripe wire and the other probe to chassis ground. Turn the ignition to run position. The meter should read 12V.