Mercedes A200 P033815 and Hard Starting: Failed Dual-Mass Flywheel Confirmed
A 2021 Mercedes A200 with 49,000 km had hard starting, severe idle shake, and metallic impact noise while P033815 named the crankshaft-position sensor circuit. Transmission removal exposed a broken dual-mass flywheel that had damaged the target/sensor area; replacing the flywheel and sensor restored a stable signal and idle.