Technical Sensor identification ducato 3.0 160 multijet

[Phillo]

Hi.

Wondering of anyone knows what this sensor/switch is on the gearbox area. I knocked it accidentally and it fell off but unsure what it does as it just pushes back in. I found a spring and little disc near it.

Thanks

 

[rayc]

Is it the reverse light switch?

 

[Phillo]

Good shout. Possibly

I will have to check the reverse lights work