02 Sensor Wiring help needed (with pics)

[keblakeney]

Hi all,
Yesterday I was changing my muffler and accidentally disconnected my O2 sensor wires.

Essentially, I want to know which wire I disconnected goes with the two black and one blue wire on the other side.

From what I've read, I'm guessing the blue wire is the ground and the two black wires are the heaters (?), however, I don't know where to place each wire.

It is a 1988 Westfalia with a EJ25 engine.

Thanks!
Kent

[MarkWard]

Is that for a VW engine?
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[keblakeney]