Trying to replace the lamdba/o2 sensor but the plastic connector plug that connects to sensor to the engine loom has melted together.
I have to cut it off but then I will be left with 3 wires coming from the loom and 4 wires from the sensor..I'm pretty good at maths but i cant seem to work out how to make 4
= 3 
Any ideas on where i can source this part or how to bypass the connector altogether.