![]() ![]() P0128 indicates an issue with the engine’s coolant temperature not reaching the proper operating temperature within a certain amount of time. The coolant temp sensor is responsible for telling the Engine Control Module (ECM) the engine’s coolant temperature. The P0128 OBD-II trouble code is a generic powertrain diagnostic code (it has the same meaning for the Ford Ranger as any other vehicle). P0128 Definition: Coolant Temp – Below Thermostat Regulating Temp Thermostat stuck open, Engine Coolant Temp Sensor (ECT) issues Lack of heat, MIL (check engine light), MPG Loss (1 or 2 tops) P0128: Coolant Temperature – Below Thermostat Regulating Temp P0128 is most often caused by a thermostat that is stuck open. In this article, we’ll explore the possible causes of the Ford Ranger P0128 OBD II trouble code and some possible solutions. It’s essential to address this issue immediately, as vehicles with this issue have increased emissions and decreased fuel efficiency. This code can appear as soon as you start your vehicle, or it can also occur while driving. Factory diagrams are much harder to read.The P0128 OBD II trouble code indicates that your Ford Ranger’s engine coolant temperature has not reached its required operating temperature within a certain amount of time after starting the truck. offers redrawn diagrams as well as factory diagrams. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. If you’re tracking down a wiring issue, is the better choice. In most cases, their diagrams are right from the factory manuals. They include wiring diagrams and technical service bulletins. Wheel Speed Sensor (Right Rear) Right rear wheel hub assembly.Ī and are professional-grade shop manuals-period. Wheel Speed Sensor (Right Front) Right front wheel hub assembly. Wheel Speed Sensor (Left Rear) Left rear wheel hub assembly. Wheel Speed Sensor (Left Front) Left front wheel hub assembly. Throttle Position Sensor (TPS) (4.0L) On throttle body. Throttle Position Sensor (TPS) (2.3L) On throttle body. Seat Pressure Sensor (Front Passenger) Under front passenger’s seat. Seat Position Sensor (Driver) Under driver’s seat. Safety Belt Tension Sensor (4-Door Super Cab) Right rear door. Safety Belt Tension Sensor (2-Door Super Cab) Base of right “B” pillar. Safety Belt Tension Sensor (Regular Cab) Base of right “B” pillar. Output Shaft Speed (OSS) Sensor (M/T) Left rear of transmission. Output Shaft Speed (OSS) Sensor (A/T) Left rear of transmission. Mass Airflow/Intake Air Temperature (MAF/IAT) Sensor (4.0L) Right side of engine compartment. Mass Airflow/Intake Air Temperature (MAF/IAT) Sensor (2.3L) Right side of engine compartment. Manifold Absolute Pressure (MAP) Sensor Top of engine. Knock Sensor (4.0L) Top center of engine. Knock Sensor (2.3L) Left front of engine. Intermediate Shaft Speed (ISS) Sensor (A/T) Left side of transmission. Heated Oxygen Sensor (HO2S) #22 (4.0L) (M/T) Left side of transmission. Heated Oxygen Sensor (HO2S) #22 (4.0L) (A/T) Left side of transmission. Heated Oxygen Sensor (HO2S) #22 (M/T) Left side of transmission. Heated Oxygen Sensor (HO2S) #21 Left rear of engine compartment. Heated Oxygen Sensor (HO2S) #12 (M/T) Right side of transmission. Heated Oxygen Sensor (HO2S) #12 (A/T) Right side of transmission. Heated Oxygen Sensor (HO2S) #11 (4.0L) Right rear of engine. Heated Oxygen Sensor (HO2S) #11 (2.3L) Rear of engine compartment. Crankshaft Position Sensor (2.3L) Lower right front of engine.Ĭrankshaft Position Sensor (4.0L) Lower front of engine.Ĭylinder-Head Temperature Sensor Right side of cylinder head.ĭifferential Pressure Feedback EGR (DPFE) Sensor Top left rear of engine.ĭigital Transmission Range (DTR) Sensor Left side of transmission.Įngine Coolant Temperature (ECT) Sensor Top right front of engine.įront Door Side Impact Sensor (Driver) In driver’s door.įront Door Side Impact Sensor (Passenger) In front passenger’s door.įront Impact Severity Sensor (Left) Left front of engine compartment.įront Impact Severity Sensor (Right) Right front of engine compartment.įuel Tank Pressure Transducer Sensor Fuel tank assembly. ![]()
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