[Engine] Timing Belt & Stop light connection?

[simec]

Hi all, not new to forum but I havent posted before.

I had a timing belt/water pump change recently and ever since then the stop light/engine management light intermittently lights up. First 100 miles were ok but after that it has been quite frequent. I intend to take it back to the garage when I am back home but at present I am working away and it is not possible to do this. Do you think it probable a sensor has been disturbed during the work carried out? Any pointers would be a good start for me. Thanks in advance.

[simec]

Me again, forgot to say van is on a 57 plate and a 1.6 HDI. Mileage is 130000.

[Rustscrat]

Hi, could be the the cam sensor which on mine is on the top of the rocker cover.
This looks at the cam pulley. (Item No.7)

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[Coco]

Or possibly crank position sensor