Hi all, bit of info please if you can. Following service/mot/cam belt change, Punto Mk2 Speedgear displays amber engine warning light. Mechanic checked and said fault code was "unidentified", and reset ecu. Later the same day fault reoccurred. Obtained my own code reader and got P0340 (Camshaft position sensor A-Bank 1 Circuit malfunction). The car appears to be running fine, no misfiring, sluggishness, etc. Booked it back in for re-check, but mechanic says the sensor isn't touched in cam belt change, but will look anyway. Any suggestions please, or am I being misled? Thanks