Engine Coolant Temperature Sensor 1 Honda Ridgeline 3.5L 2006-2014 Location

Exact Component Location

This video focuses exclusively on showing you the exact, precise location of the Engine Coolant Temperature (ECT) Sensor 1 on this vehicle. On the first-generation Honda Ridgeline, look down into the engine bay on the driver’s (left) side. The ECT Sensor 1 is threaded directly into the aluminum thermostat housing assembly, positioned on the back-side of the engine block just below the throttle body and main air intake ducting, right where the upper radiator hose connects to the engine block.

Note on Dual Sensors: This vehicle utilizes two coolant temperature sensors. ECT Sensor 1 is located at the thermostat housing on the engine and sends data directly to the computer for fuel management. ECT Sensor 2 is located at the bottom of the radiator to control the cooling fans.

How This Video Helps Your DIY Repair

Locating the sensor quickly is the crucial first step for any successful do-it-yourself project. By seeing the exact spot and identifying how the battery tray, shift linkage cables, and the flexible intake snorkel frame the workspace beforehand, you can easily plan your approach. This visual guide shows you exactly how to navigate your socket and extension past the wiring harnesses, save valuable time, and proceed with confidence.

Symptoms of a Faulty ECT Sensor 1

A failing ECT Sensor 1 sends erratic or incorrect temperature data to the engine control module, disrupting both fuel management and dashboard instrumentation. Common symptoms include an illuminated Check Engine Light (CEL) with codes like P0117 or P0118, a temperature gauge on the dash that drops to zero or spikes erratically, the radiator cooling fans running continuously at maximum speed, difficult or extended engine cranking when cold, and a rich fuel condition that hurts fuel economy.

Safety Measures and Precautions

Before beginning any work on your vehicle, it is essential to prioritize safety. Always wear proper protective gear, including safety glasses and mechanic gloves, to protect your eyes and skin from scalding coolant, sharp engine castings, and road grime. Because this sensor is integrated directly into the engine’s pressurized cooling passages, stay alert, ensure the engine is completely turned off and furthermore ensure it is fully cooled down before unthreading the sensor, and keep a drain pan ready beneath the area to catch the engine coolant that will spill out during the swap.

Expert Assistance and Comments

As an experienced mechanic with years of hands-on automotive repair knowledge, I am here to support you. If you have any specific questions about releasing the Honda spring-style electrical connector, applying thread sealant to the new sensor, bleeding trapped air out of the cooling system afterward, or encounter a problem while working, feel free to drop a message in the comments below, and I will help you with your car repair.