Fault code P0103 – a step-by-step guide to diagnosing and fixing it

Error code P0103 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a fault in the mass air flow sensor (MAF) or air flow meter where the signal is too high. The DTC P0103 means "Mass Air Flow Circuit High Input" and indicates a problem with the mass air flow sensor circuit. This error code can occur with different manufacturers, whereby the specific limit values can vary depending on the vehicle brand.

What can cause this fault code?

• Defective mass air flow sensor (MAF sensor)
• Dirty or clogged mass air flow sensor
• Damaged wiring to the MAF sensor
• Corroded or loose plug connections
• Defective engine control unit (ECU)
• Leaking intake hoses downstream of the MAF sensor
• Faulty air filter or clogged air filter housing
• Problems with the power supply to the sensor

What symptoms occur in parallel with fault code P0103?

• Starting problems: The vehicle is difficult to start or requires several attempts to start
• Uneven idling: The engine runs unevenly at idle
• Loss of power: Significantly reduced engine power while driving
• Increased fuel consumption: Noticeably higher consumption than usual
• Jerking when accelerating: Uneven acceleration or engine misfires
• Black smoke from the exhaust: Air/fuel mixture too rich
• Check engine light: Continuously lit or flashing warning light

How can the problem with error code P0103 be resolved?

• Troubleshooting trouble code P0103 requires a systematic approach to identify the exact cause.
• Clean the mass air flow sensor: Remove the MAF sensor and clean it carefully with special MAF cleaner or isopropyl alcohol, allow it to dry completely and reinstall it
• Replacing the mass air flow sensor: Replace the defective MAF sensor with a new original part or a high-quality replacement, reprogram the control unit if necessary
• Check wiring and plug connections: Check all cables to the MAF sensor for damage, clean corroded contacts and replace defective wiring harnesses
• Check the intake system for leaks: Check all hoses and connections after the mass air flow sensor, replace cracked or porous hoses
• Check air filter and housing: Replace a dirty air filter and clean any debris from the air filter housing
• Measure the power supply: Check the power supply to the MAF sensor with a multimeter and repair defective circuits