Fault code P1110 – a step-by-step guide to diagnosing and fixing it

Error code P1110 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system detects a fault in the intake air system, specifically a defect or malfunction of the intake air temperature control valve (IAT). This manufacturer-specific DTC P1110 mainly affects the engine management and air supply control. The exact definition of the trouble code may vary slightly for different vehicle brands.

What causes can this error code have?

• Defective intake air temperature control flap
• Damaged or dirty IAT sensor
• Broken or corroded cable connections
• Defective control unit for the air supply
• Clogged or damaged air filter
• Vacuum leak in the intake system
• Faulty throttle valve
• Faulty plug connections on the sensor

Which symptoms occur in parallel with fault code P1110?

• Loss of engine power: Reduced acceleration and reduced top speed
• Unsteady idling: Engine runs unevenly at idle speed
• Increased fuel consumption: Significantly higher fuel consumption than usual
• Starting problems: Difficulty starting the engine when cold
• Jerky engine: Uneven engine running at different engine speeds
• Deteriorating exhaust values: Increased emission values during the emissions test

How can the problem with fault code P1110 be rectified?

• Repairing fault code P1110 requires a systematic diagnosis of the intake air components.
• Replacement of the defective intake air temperature control flap with a new part or a high-quality spare part
• Cleaning or replacement of the IAT sensor with special sensor cleaner or complete replacement in the event of irreparable damage
• Checking and repairing all cable connections in the intake system, including soldering damaged wires and replacing corroded plugs
• Replacement of the air filter and thorough cleaning of the entire intake tract to remove dirt and deposits
• Locating and sealing vacuum leaks by replacing damaged hoses or seals
• Calibration or replacement of the engine control unit according to the manufacturer's specifications with appropriate programming