Join Date: Nov 2012
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oxygen sensor matching
My first post here so please be gentle.....
Working on a 1998 Legacy Outback. 2.5L, manual. The engine is not the original.
Starts and runs well, but Check Engine is on. Codes indicate both O2 sensors. This makes sense, because both sensors are not connected!
The rear sensor does not have a plug any longer. Just three wires hanging loose. Black and two whites. The two whites = heater, right? (No polarity on these - right?) and black = signal? The wiring harness has the plug with 3 wires. I think I can sort out this end. Find +12Volts & ground for the heater and the black goes to black for the signal.
The front is a problem. The sensor has a 4 wire plug - (2) white, (1) black & (1) grey. The wiring harness has a 3 pin plug - kind of a triangular shape roughly speaking. Colors look like white/red, white and black. (Hard to tell.) The engine must be from a different year or different vehicle and the harness doesn't match the sensor.
Engine is number: 475746. Any idea what this is from?
Am I correct in thinking if I can get an OEM sensor that matches the engine and screw it into the exhaust (same threads hopefully??) that all should work OK?
Thanks for reading this long post...