P0125 MERCEDES-BENZ - Insufficient Coolant Temperature for Closed Loop Fuel Control
P0125 MERCEDES-BENZ Possible Causes
- Low engine coolant level
- Leaking or stuck open thermostat
- Faulty Engine Coolant Temperature (ECT) sensor
- Engine Coolant Temperature (ECT) sensor harness is open or shorted
- Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
First diagnose P0125 MERCEDES-BENZ code
Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.
Cost of diagnosing the P0125 MERCEDES-BENZ code
Labor: 1.0The cost of diagnosing the P0125 MERCEDES-BENZ code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
When is the P0125 MERCEDES-BENZ code detected?The voltage sent to Engine Control Module (ECM) from the Engine Coolant Temperature (ECT) sensor is not practical, even when some time has passed after starting the engine. The engine is taking too long to reach the normal temperature level.
P0125 MERCEDES-BENZ Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0125 Mercedes-benz DescriptionThe Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.
P0125 MERCEDES-BENZ More InformationNeed more information on how to fix the P0125 MERCEDES-BENZ code?
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Need more help?Get the P0125 Mercedes-benz code diagnosed by a professional: Find a repair shop in your area
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