Fault code P0100 – a step-by-step guide to diagnosing and fixing it

Error code P0100 is displayed and the check engine light is on - what does this mean?

The DTC P0100 is triggered by the OBD/EOBD system when a circuit error is detected in the mass air flow sensor (MAF sensor). This trouble code relates to the engine management system and can occur with slight variations for different manufacturers.

What causes can this error code have?

• Defective mass air flow sensor (MAF sensor)
• Damaged or corroded cable connections to the MAF sensor
• Loose or defective plug connections on the mass air flow sensor
• Dirty or clogged air filter
• Leaks in the intake system
• Defective engine control unit (ECU)
• Broken ground wire of the MAF sensor
• Short circuit in the wiring

What symptoms occur in parallel with fault code P0100?

• Starting problems: The vehicle is difficult to start or does not start at all
• Uneven idling: The engine runs unevenly at idle speed
• Loss of power: Noticeable reduction in engine power while driving
• Increased fuel consumption: Significantly higher gasoline or diesel consumption
• Jerking when accelerating: Engine stutters or jerks when accelerating
• Engine stalling: vehicle stalls while driving or idling

How can the problem with fault code P0100 be rectified?

• Correcting fault code P0100 requires a systematic diagnosis of the mass air flow sensor components.
• Replacing the defective mass air flow sensor with a new original part or high-quality spare part
• Cleaning the dirty MAF sensor with special MAF cleaner and subsequent function test
• Repair or replacement of damaged cable connections between MAF sensor and engine control unit
• Check and clean all plug connections on the mass air flow sensor and apply contact spray
• Replacing the clogged air filter and checking the entire intake system for leaks
• Professional diagnosis and, if necessary, replacement of the engine control unit in the event of an ECU defect