The sensor is on the side of a cone-shaped part of the transmission. It is located under the centre of my bongo, and the cone is between the gearbox and the prop shaft. I need a new sensor and wire. Does anyone know what this is, so I can order a replacement?

I would attach photos, but I can't work ...

Thanks all for the advice. Sounds like I need to ask them to fix the wire; failing that get some more detailed info. Great to have people out there who know what they are doing.

The hold light is flashing on my bongo and my local garage has identified the possible problem as being a broken wire on a sensor on the rear gearbox. They tell me that the sensor is located on the output shaft, just as the prop shaft goes in. There's 8-12 inches of wiring and plug. From this ...