In Honda cars with dual coolant-temperature sensors, ECT Sensor 2 is typically located near the engine's thermostat housing on the engine block or cylinder head, though exact placement varies by model and engine code.
Engine coolant temperature sensors inform the ECU and other systems about engine temperature. In some Honda engines, there are two separate sensors: one primarily used by the ECU, and a second used for other systems such as the gauge or for redundant sensing. This article explains where to look and how to verify the correct sensor in common Honda engines.
Common locations you may find ECT sensor 2
These are typical spots where people find the second coolant-temperature sensor in many Honda engines. Check your owner's manual or service diagrams for your exact model to be sure.
- Near the thermostat housing on the engine block or cylinder head, often on the side facing the radiator. This is a common spot for the "ECT2" sensor in many engines.
- On or near the engine coolant passage, sometimes mounted on a coolant pipe or the water pump housing.
- Behind or beside the intake manifold in some K-series or newer engines, where space requires a compact sensor placement.
- On the cylinder head or along the upper coolant hose connections in certain B-series/J-series engines.
The exact place can vary by model and engine family; always cross-check with the vehicle’s service manual or a wiring diagram to avoid confusion with ECT1 or other temperature sensors.
How to identify ECT sensor 2 in your Honda
To be sure you’re working with ECT sensor 2, use these identification steps and reference tools.
- Obtain the engine wiring diagram for your exact model and engine code from the service manual or a reputable source.
- Locate both coolant temperature sensors in the engine bay; the ECT sensors will have two pins, but the color of their connectors or the labeling on diagrams will tell you which is ECT2.
- Follow the sensor wires to the ECU and to other systems (like the gauge cluster). The sensor whose signals do not feed the gauge or ECU as expected may be the ECT2 depending on your model.
- Consult a trusted technician or dealership if you’re unsure, as misidentifying sensors can affect engine performance.
Having a precise diagram is the best way to avoid swapping the wrong sensor and to ensure you’re addressing the correct component when diagnosing temperature-related issues.
Summary
For Honda vehicles, ECT Sensor 2 is generally located near the engine’s thermostat housing or nearby coolant passages, but the exact spot depends on the model and engine code. Use the service manual or wiring diagrams to confirm, and rely on model-specific guidance to identify the correct sensor and its role in the vehicle’s cooling and engine-management systems.