Help - 2.5 Legacy Lambda Sensor wiring

[IainG]

Hi,

During the course of removing the engine and wiring from my 2003 2.5 Legacy, the plug on the harness side of the lambda sensor went missing. Here is what Richard at RJES says...

Looking at the wiring diagram, it’s easy to see how to connect up 2 of the 4 wires. However, the diagram does not show sufficient detail for me to work out which way around to connect the other two, and it does matter which way around they go. I am unsure whether connecting them the wrong way around will just not work, or whether it could also cause damage. I’d say I’m 90% sure I know which way around the last two wires go. To be 100% sure I’d need to have a look at undamaged harness of the same spec and it’s lambda sensor. Unfortunately it’s not a very common engine management system you’ve got.

Does anyone have a Legacy motor of the same vintage that you can take a photo of?

Cheers, Iain.

[Aidan]

drop SyncroAndy a pm

[syncroandy]

Hi Iain, presumably you need info to help you hook it up with an alternative connector if you've lost the Subaru one, in which case simple list is probably more useful than a photo (and easier for me to get as I don't have to leave my seat ).

Pin 1 - Heater control to ECU - White/Blue
Pin 2 - Power to heater from main relay - Yellow/Red
Pin 3 - Sensor ground to shield joint connector near ECU - Black/White
Pin 4 - Sensor signal to ECU (shielded) - White

This is from a 2001 harness but yours is probably the same.

HTH