Lambda sensor wiring

[sam3007]

OK well that's good to know I think! Atleast I don't have dodgy cut wiring to chase up.

I have a bunch of unused plugs in the loom above the exhaust manifold, so I expect one of those could be the original lambda plug. Is it worth trying to source the correct sensor? I imagine a one wire sensor isn't going to make a huge difference to the running of the engine?

My car does have a cat fitted, which I thought was a bit unusual for the age of the car.
It also doesn't have any sort of afm or maf fitted before the throttle body

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