foxgap Posted April 19, 2023 Share Posted April 19, 2023 The heater circuit on the front O2 sensor is throwing a check engine lite. The O2 is brand new from Subaru. We know that it is behind the glovebox and is brown in color. But there are 2 brown relays there. We need to find out if it is the right relay or is it the left relay? What does the other relay do? Thanks all, frustrated Mark Link to comment Share on other sites More sharing options...
ocei77 Posted April 21, 2023 Share Posted April 21, 2023 Subaru Factory Service Manuals (FSM) - Every Model - USDM/EU (sl-i.net) Look up your model and year and go to the wiring diagrams, find it there. O.. Link to comment Share on other sites More sharing options...
foxgap Posted April 21, 2023 Author Share Posted April 21, 2023 Thank you very much !!!!!!!!!!!!! Link to comment Share on other sites More sharing options...
foxgap Posted April 23, 2023 Author Share Posted April 23, 2023 We found it and it was not functioning. Replaced it and 5 min later the brand new Subaru O2 sensor threw a code for low voltage. Got another one under warranty and now the car works just fine after setting the monitors. YEAH Mark 1 1 Link to comment Share on other sites More sharing options...
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