Fault code P1100 – a step-by-step guide to diagnosing and fixing it

Error code P1100 is displayed and the check engine light is on - what does this mean?

The DTC P1100 is recognized by the OBD system when a problem is detected with the mass air flow sensor (MAF) or the intake air control. This manufacturer-specific error code mainly affects the fuel-air mixture and the engine control unit. This code can have different meanings for different manufacturers, but usually refers to problems in the intake system.

What causes can this error code have?

• Defective mass air flow sensor (MAF sensor)
• Dirty or clogged air filter
• Leaking intake lines or hoses
• Defective throttle valve or throttle valve sensor
• Faulty cable connections to the MAF sensor
• Defective control unit (ECU)
• Vacuum leaks in the intake system
• Dirty or defective injection nozzles

What symptoms occur in parallel with fault code P1100?

• Loss of engine power: Noticeable reduction in engine power while driving
• Unsteady idling: Engine runs unevenly or stutters when idling
• Increased fuel consumption: Significantly higher fuel consumption than usual
• Starting problems: Difficulty starting the engine, especially in cold weather
• Jerking when accelerating: Engine jerks or hesitates when accelerating
• Black smoke from the exhaust: Signs that the fuel-air mixture is too rich

How to fix the problem of error code P1100?

• Repairing error code P1100 requires a systematic approach to identifying and eliminating the cause.
• Clean or replace the mass air flow sensor: Remove the MAF sensor, clean it with special MAF cleaner or replace it completely if it is defective (cost: 150-400 euros)
• Change the air filter: Replace old, dirty air filter with a new one, checking the entire air filter housing for damage (cost: €20-50)
• Check and seal intake lines: Check all hoses and connections in the intake system for cracks or loose connections and replace defective parts (cost: €30-150)
• Clean the throttle valve: Remove the throttle body, clean thoroughly with throttle body cleaner and check that the sensor is working correctly (cost: €80-200)
• Check and repair cable connections: Inspect all electrical connections to the MAF sensor for corrosion, breaks or loose contacts and repair (cost: 50-120 euros)
• Locate and repair vacuum leaks: Use smoke test or other diagnostic methods to find leaks in the vacuum system and replace corresponding hoses or seals (cost: €40-200)