I think my lambda sensor is knackered but I was hoping to test it with a multimeter before replacing it but I don't know which colour wire is which as they are different on either side of the plug?
Does anyone know which wires are the 12v heater and signal please?
The car is a P1 with a 3 wire lambda.

 

The black is ths signal wire the other 2 are the heaters. I just got one from Camskill for my 99 Type R and seems to be happy with it.