LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> BMW >> 1988 >> 325is Automatic >> Repair and Diagnosis >> Engine Performance >> System >> MOTRONIC CEC System >> Diagnostic Testing >> Trouble Code 03 - Coolant Temperature Sensor
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Trouble Code 03 - Coolant Temperature Sensor

The coolant temperature sensor is faulty or the engine is running too hot or too cold. This is due to a faulty cooling system component. To correct this test the coolant temperature sensor and cooling system components.