981 · Cooling

P0116

Engine Coolant Temperature Sensor Range/Performance

MED SEVERITY

The ECT signal is implausible relative to other data.

SYMPTOMS

  • Check-engine light
  • Cooling fan or gauge anomalies
  • Economy/drivability issues

LIKELY CAUSES

  • Failing ECT sensor
  • Wiring fault
  • Thermostat fault
  • Low coolant

DIAGNOSIS STEPS

  • Compare ECT vs IAT at cold start
  • Check wiring/connector
  • Verify coolant level

RELATED PARTS

  • ECT sensor
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