Toyota Yaris 2010 Error P0016: Causes, Symptoms, and Possible Fixes

Hello, I'm experiencing error code P0016 on my Toyota Yaris 2010. The engine starts regularly, but occasionally I hear a crank noise when turning the ignition key. Initially, I thought it might be a faulty starter motor, but research suggests that P0016 could also indicate issues with the timing belt or chain. This diagnostic trouble code is related to the intake valve timing and may point to problems in the camshaft position sensor or the associated drive mechanism. I'm looking for reliable information on how to diagnose and resolve this issue safely.