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O2 Sensor Wire Identification
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harleykwa Offline
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Post: #1
O2 Sensor Wire Identification
This is the procedure to identify the wires-
Disconnect the wire harness, turn on the ignition and probe for a wire produces 12 volts. This will be the heater circuit. Next find the 2 wires that produce exactly 0 volts. These will be the heater ground and the signal ground. The remaining wire should be your signal wire.

MY QUESTION IS
Do I check all four wires one at a time with the Red probe on my meter and the meters black probe to the metal on the vehicle? Or, do I use the Red and Black probe to test all possible combination of the four wires only without using the vehicle as ground?
07-23-2008 08:06 AM
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