Hi CRV boffins hope you can help . Just had timing belt replaced but on driving the car the engine management light lit again . Should I invest in genuine sensor from honda to try to get light out . 

I would definitely return the car to the garage that replaced the timing belt and ask them to check the fault code (free of charge) to see if it is associated with any of the work that has been carried out.
It may be a connection for a sensor that hasn't been clipped back on or something simple that can be fixed at no cost.
After that then at least you know the fault code and can go from there

Let us know what you find

Thank you I will keep you posted thank you 😊

Had genuine knock sensor replaced and the light is now out . Finally  auto spark got a peck on the cheek