Error P0016 after timing belt change, 1.5DCI

Hello, yesterday I had the timing belt changed in a free 1A workshop. Car is running and so it doesn’t really notice anything about the performance. I then plugged in a cheap OBD tester from a edge, which then shows me the error P0016 (position of crankshaft/position of camshaft interaction group 1 sensor A). Before changing the timing belt, the error was not in the memory with the same tester. Now a few questions: Could when changing a mistake has been made and a tooth has skipped, but would it still run normally? Could, if it is only a sensor error, a damage occur and where are the sensors for crankshaft and camshaft with the K9K motor? Thanks already for the help