Honda Engine Coolant Temperature (ECT) Sensor 37870-RTA-005

This is the genuine Honda Engine Coolant Temperature (ECT) Sensor, part number 37870-RTA-005. If you’re chasing weird temp readings, rich/lean issues, or random cold/hot drivability problems, this is usually where you start. The ECT sends real-time coolant temp data to the ECU so it can control fuel, ignition timing, cooling fan operation, and overall engine behavior the way Honda intended.

On many carslike the 20062011 Honda Civic Sithe ECT sensor sits near the thermostat housing on the block. Years of heat cycles, coolant contamination, or internal failure will skew the signal. In the real world that looks like a bouncing temp gauge, trash fuel economy, hard starting when hot or cold, or even an overheating situation because the fans dont kick on when they should. A fresh OEM Honda ECT sensor replacement brings the readings back in line and lets the ECU do its job again.

This is a Genuine Honda ECT sensor built to OEM spec for thread fit, connector engagement, and long-term electrical reliability. Whether youre clearing a check engine light, sorting out a cooling issue, or just doing preventative maintenance on a high-mile Honda or Acura, this is the correct OEM Honda ECT sensor to buy for a huge range of late-model applications. We run this exact style sensor on our own cars for anything from daily driving to track use.

Key features

• Genuine Honda engine coolant temperature sensor (37870-RTA-005)
• Sends accurate coolant temp data to the ECU so fueling and timing stay on target
• Controls cooling fan operation and helps keep engine temps stable under load
• Proper fix for bad sensors causing poor MPG, rich/lean conditions, or overheating
• Meets OEM Honda fit, function, and reliability standards not a cheap no-name copy

Vehicle fitment

• 20132015 Acura ILX
• 20072026 Acura MDX
• 20172021 Acura NSX
• 20072025 Acura RDX
• 20092012 Acura RL
• 20142020 Acura RLX
• 20072014 Acura TL
• 20152025 Acura TLX
• 20092014 Acura TSX
• 20102013 Acura ZDX
• 20082017 Honda Accord V6
• 20182022 Honda Accord
• 20062015 Honda Civic Si
• 20122015 Honda Civic EX / LX / DX
• 20162021 Honda Civic Si / 1.5T
• 20102015 Honda Crosstour
• 20072011 Honda Element
• 20072008 Honda Fit
• 20162022 Honda HR-V
• 20072026 Honda Odyssey
• 20192026 Honda Passport
• 20092025 Honda Pilot
• 20092026 Honda Ridgeline
• 20062009 Honda S2000

If your temp gauge lies, the fans act drunk, or the car runs poorly hot or cold, its time for a Honda engine temperature sensor you can trust. Buy Honda 37870-RTA-005 sensor here as a Genuine Honda ECT sensor for sale. This is the OEM Honda ECT sensor you want when youre shopping Honda coolant temp sensor buy, OEM Honda ECT sensor online, or any Acura ECT sensor purchase for the models listed above. Install it once, clear the codes, and your cooling system and fueling strategy go back to behaving like they should.