Fault code P1103 – a step-by-step guide to diagnosing and fixing it

Error code P1103 is displayed and the check engine light is on - what does this mean?

The DTC P1103 is a manufacturer-specific fault code that is recognized by the OBD system and indicates a problem with the mass air flow sensor (MAF) or the air intake. This trouble code occurs when the control unit detects a deviation between the expected and actual mass air flow values. This fault code can have different meanings for different manufacturers, but usually refers to problems in the air intake system.

What causes can this fault code have?

• Defective or dirty mass air flow sensor (MAF sensor)
• Leaks in the intake system between the MAF sensor and throttle valve
• Damaged or clogged air filter
• Defective plug connections on the mass air flow sensor
• Cracks or holes in the intake hose
• Faulty throttle valve or throttle valve actuator
• Defective engine control unit
• Vacuum leaks in the intake system

What symptoms occur in parallel with fault code P1103?

• Erratic idling: The engine runs irregularly at idle or fluctuates in speed
• Loss of power: Significantly reduced engine power, especially when accelerating
• Increased fuel consumption: The vehicle consumes more fuel than usual
• Starting problems: The engine is difficult to start or requires several attempts to start
• Jerking while driving: Uneven engine running while driving
• Engine stalling: The engine stalls, especially at idle or at low engine speeds

How can the problem with error code P1103 be rectified?

• Repairing EOBD error code P1103 requires a systematic diagnosis of the air intake.
• Clean or replace the mass air flow sensor: Remove the MAF sensor, clean with special cleaner or replace completely if defective (cost: 80-300 euros)
• Check the intake system for leaks: Check all hoses, connections and seals between the air filter and throttle valve and replace defective parts
• Change the air filter: Install a new air filter if the old one is clogged or very dirty (costs: 15-40 euros)
• Clean the throttle valve: Remove the throttle valve and clean it thoroughly with throttle valve cleaner to remove deposits
• Check plug connections: Check all electrical connections on the MAF sensor for corrosion or loose contacts and clean them
• Diagnose the engine control unit: Have a deep diagnosis carried out to check whether the control unit is faulty and needs to be replaced