Fault code P1114 – a step-by-step guide to diagnosing and fixing it

Error code P1114 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a fault in the intake system temperature sensor (IAT) or its circuit. This DTC P1114 indicates an implausible voltage or a signal failure in the intake air temperature sensor. This trouble code may have slightly different definitions for different manufacturers, but generally refers to intake air temperature monitoring.

What causes can this error code have?

• Defective intake air temperature sensor (IAT sensor)
• Damaged or corroded cable connections to the sensor
• Short circuit in the sensor wiring
• Interrupted ground connection of the sensor
• Defective engine control unit (ECU)
• Dirty or damaged plug connections
• Incorrectly installed or unsuitable sensor after repair

What symptoms occur in parallel with error code P1114?

• Starting problems: The vehicle starts poorly, especially in cold temperatures
• Unsteady idling: Engine runs unevenly at idling speed
• Increased fuel consumption: Noticeably higher consumption due to incorrect mixture formation
• Loss of power: Reduced engine power, especially when starting cold
• Black smoke: Dark exhaust fumes due to excessively rich fuel/air mixture
• Check engine light: Permanent display of the check engine light

How can the problem with error code P1114 be rectified?

• The repair requires a systematic diagnosis to identify the exact cause.
• Sensor replacement: Replace the defective IAT sensor with an original part or a spare part of equivalent quality and calibrate it correctly
• Cable repair: Locate damaged wiring, replace severed or corroded cables and properly insulate all connections
• Clean plug connection: Remove sensor plug, clean contacts with contact spray and check for tight fit and freedom from corrosion
• Check the ground cable: Check the ground connection of the sensor, clean if necessary or make a new ground connection
• Control unit reset: After the repair, delete the fault memory and carry out a test drive to confirm proper function
• Complete system diagnostics: Use a professional OBD scanner to check all parameters of the intake system and identify any other defective components