Where is the temperature sensor on a Honda HR-V?
The HR-V uses several temperature sensors rather than a single unit: an outside air temperature sensor in the front bumper, an engine coolant temperature sensor on the engine, and an interior cabin temperature sensor inside the dash. This article explains where to find each and what they do.
Key temperature sensors on the Honda HR-V
Below are the main sensors that provide temperature data for engine management and climate control. Locations are typical for most HR-V models, but exact placement can vary by year and trim.
- Outside air temperature sensor (OAT) – located in the front bumper area behind the grille or bumper cover, often near the lower grille opening.
- Engine coolant temperature sensor (ECT) – mounted on the engine block, typically near the thermostat housing or along the cylinder head where coolant flows.
- Interior cabin temperature sensor – located inside the cabin behind the dashboard, commonly near the HVAC control unit or within the climate control housing.
These sensors feed data to the vehicle's climate control system and the engine management unit, influencing outside temperature display, air conditioning behavior, fan speeds, and engine warm-up routines.
Outside air temperature sensor (OAT)
The OAT sensor is usually tucked into the front bumper region, behind the grille or a bumper cover. Access may require removing a panel or the bumper shield, depending on the model year. If the reading seems inaccurate, check that the sensor is clean, unobstructed, and securely mounted, and inspect its electrical connector for corrosion or looseness.
Engine coolant temperature sensor (ECT)
The ECT sensor sits on the engine block, near the thermostat housing or along the cylinder head. It monitors the coolant temperature to help the ECU adjust fuel mixture, ignition timing, and idle speed. If the sensor fails, you may see poor fuel economy, hard starting when cold, or a check engine light with a related code. Replacement typically requires a shop manual and basic engine bay access.
Interior cabin temperature sensor
The cabin sensor is placed inside the dashboard, close to the HVAC housing or control module. It measures the air temperature inside the cabin to help regulate fan speed and climate mode. If readings are off, inspect the sensor’s housing for obstructions, and check the wiring and connectors behind the dash or glove box area.
How to locate and inspect sensors
If you plan to inspect or service these sensors, follow general guidance below. Always ensure the vehicle is off and the battery is disconnected when working around electrical connectors to avoid short circuits.
- Identify the sensor you need to check (OAT, ECT, or cabin) using the sections above as a guide based on symptoms.
- For the OAT sensor, visually inspect the front bumper area and the wiring harness at the sensor plug for damage or corrosion.
- For the ECT sensor, locate the sensor on the engine block near the thermostat housing; unplug the connector and inspect for corrosion. If trained, use a multimeter to verify resistance per the service manual.
- For the cabin sensor, access the area behind the dash near the HVAC unit and check the sensor and its connector for secure fit and cleanliness.
- If a sensor is suspected to be faulty, consult the owner's manual or a qualified technician for proper testing and replacement procedures.
These checks can help determine whether a sensor is faulty or simply needs cleaning and secure connections. Always refer to the official service manual for your exact year and engine variant.
Summary
The Honda HR-V does not rely on a single temperature sensor. It uses at least three: an outside air temperature sensor in the front bumper, an engine coolant temperature sensor on the engine, and a cabin temperature sensor inside the dash. Understanding the locations can help with diagnostics, maintenance, and ensuring accurate climate control readings and engine management.
