Fault code P0373 – a step-by-step guide to diagnosing and fixing it

Error code P0373 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a fault in the ignition system, more specifically a problem with the ignition timing reference signal A. This DTC P0373 indicates a fault in the crankshaft sensor circuit or related components that are responsible for precise ignition control.

What can cause this fault code?

• Defective crankshaft sensor
• Damaged sensor cable or plug connections
• Dirty or corroded sensor ring on the flywheel
• Defective engine control unit (ECU)
• Loose or damaged wiring to the ignition module
• Faulty camshaft sensor signals
• Mechanical problems on the flywheel or ring gear
• Malfunctions due to electromagnetic interference

What symptoms occur in parallel with fault code P0373?

• Starting problems: The vehicle is difficult or impossible to start
• Uneven idling: Engine runs unevenly at idle speed
• Loss of power: Noticeable reduction in engine power
• Jerking when driving: Especially at low engine speeds
• Increased fuel consumption: Inefficient combustion due to incorrect ignition timing
• Stalling of the engine: Sudden shutdown while driving

How to fix the problem of error code P0373?

• The repair requires a systematic diagnosis of the ignition components. Here are the most important solutions:
• Check and replace the crankshaft sensor: Inspect the sensor for damage and replace if defective (cost: 50-150 euros)
• Check wiring and plug connections: Check all cables to the crankshaft sensor for breaks, corrosion or loose connections and repair them
• Clean the sensor ring on the flywheel: Remove any dirt or metal shavings from the ring gear that generates the signal for the crankshaft sensor
• Diagnose the engine control unit: Test ECU with professional diagnostic software and reprogram or replace if necessary
• Check the camshaft sensor: Since both sensors work together, also test the camshaft sensor for proper function
• Inspect the entire ignition system: Inspect ignition coils, ignition cables and other components for defects and replace them