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Restricted ducts prevent airflow, causing overheating despite fan operation. ASE L3 stresses airflow checks for battery cooling. Spark, O2, or exhaust parts don’t apply.

The crankshaft position sensor is critical for restart synchronization. A faulty signal causes rough or failed restarts. ASE L3 emphasizes unique ICE restart demands. ABS fuses, blower resistors, or refrigerant don’t explain crank sensor codes.

The brake pedal sensor signals driver input for regen blending. If it fails, regen is disabled and warnings appear. ASE L3 stresses electronic braking inputs as critical to hybrid operation. Timing, catalysts, or A/C systems are not causes.

Idle-stop requires correct temperature input. A faulty coolant sensor prevents shutdown. ASE L3 highlights coolant sensor importance in stop/start operation. Wheel sensors, blowers, or exhaust leaks are not causes.

If the check valve leaks, pressure bleeds down, delaying restart. ASE L3 emphasizes restart-specific fuel delivery faults. Injectors, PCV, or O2 heaters don’t match.