P0115
Engine Coolant Temperature (ECT) Sensor 1 Circuit
1999-2000 BMW 323i E46 2.5L I6 🇨🇦
Moderate SeverityPowertrain
Description
General malfunction in the engine coolant temperature sensor circuit.
Symptoms
- Check Engine Light
- Poor fuel economy
- Hard starting
- Incorrect temp gauge reading
- Fans not operating correctly
Common Causes
- Faulty ECT sensor
- Wiring damage
- Corroded connector
- Low coolant level
Diagnostic Steps
- Test ECT resistance at known temperature
- Inspect wiring
- Check coolant level
- Compare ECT to IAT at cold start
Repair Notes
Replace ECT sensor or repair wiring. Verify coolant level.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P0115 on Other Vehicles
Common Questions
What does code P0115 mean on a 1999-2000 BMW 323i E46?
P0115 stands for "Engine Coolant Temperature (ECT) Sensor 1 Circuit". General malfunction in the engine coolant temperature sensor circuit.
What are the symptoms of P0115 on a BMW 323i E46?
Common symptoms of P0115 include: Check Engine Light, Poor fuel economy, Hard starting, Incorrect temp gauge reading, Fans not operating correctly.
What causes P0115 on a 1999-2000 BMW 323i E46?
Common causes of P0115 include: Faulty ECT sensor, Wiring damage, Corroded connector, Low coolant level.