Fault code P0112 – a step-by-step guide to diagnosing and fixing it

Error code P0112 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a fault in the intake air temperature sensor circuit, which is reporting a signal that is too low. This DTC P0112 affects the engine management system and can affect fuel injection and ignition. Slight deviations in the diagnosis may occur with different manufacturers, but the basic problem remains the same.

What causes can this error code have?

• Defective intake air temperature sensor (IAT)
• Short circuit in the sensor wiring
• Corroded or loose plug connections
• Damaged cable insulation
• Defective engine control unit (ECU)
• Interruption in the sensor ground cable
• Moisture in the sensor housing

What symptoms occur in parallel with fault code P0112?

• Starting problems: The vehicle is difficult to start, especially when the engine is cold
• Irregular idling: The engine runs erratically or stutters when idling
• Increased fuel consumption: Significantly higher consumption due to incorrect mixture preparation
• Loss of power: Noticeable reduction in engine performance
• Black smoke: Dark exhaust fumes due to excessively rich fuel/air mixture
• Jerking when driving: Uneven engine performance while driving

How can I fix the problem with error code P0112?

• Repairing trouble code P0112 requires a systematic approach to identify the exact cause.
• Replacement of the defective intake air temperature sensor with an original part or equivalent component
• Repair or replacement of the damaged sensor wiring including insulation and plug connections
• Cleaning and treatment of corroded contacts with contact spray and subsequent sealing
• Checking and repairing the ground cable between the sensor and engine control unit
• Drying and sealing the sensor housing in the event of moisture damage
• Replacement of the engine control unit in the event of a proven ECU defect after all other causes have been ruled out