P1112 — BMW — Engine Coolant Temperature Radiator Outlet Sensor High Input

P1112 (BMW): Engine Coolant Temperature Radiator Outlet Sensor High Input — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Engine Coolant Temperature Radiator Outlet Sensor High Input. Source catalogue definition; confirm applicability using vehicle service information.

Affected system: Powertrain

Symptoms

  • Check Engine light illumination
  • Increased engine fuel consumption
  • Potential engine overheating conditions
  • Irregular engine idle speed
  • Poor engine performance during warm-up

Possible causes

  • Faulty coolant temperature radiator outlet sensor
  • Open or short circuit in the sensor wiring harness
  • Corroded electrical connector pins
  • High resistance in the sensor ground circuit
  • Failed engine control module (ECM) circuit

What to check

  • Inspect the electrical wiring and connector at the radiator outlet sensor for damage or corrosion.
  • Measure the resistance of the sensor using a multimeter and compare it to manufacturer specifications.
  • Verify the reference voltage provided by the engine control module to the sensor connector.
  • Check the ground continuity of the sensor circuit back to the chassis or engine block.
  • Observe live data values from the coolant temperature sensor using a diagnostic scan tool.