Mazda 6 GY 2.0 petrol engine starts badly

Hello together, my Mazda 6 GY 2.0 petrol bj. 2002 with 141hp starts badly. Specifically: No matter what temperature, it always needs 4-7 revolutions until it starts, but then reliable. The battery is not yet old and both charged, as well as fine, because it is not. I have noticed with another vehicle that the ECU calculates the OT position itself, if the camshaft sensor is defective and therefore the start process lasts longer. Can this also be the case with Mazda? Or do you have other ideas? Thank you for your help. Florian