Your engine's coolant temperature sensor is a small part with a big job: it tells the engine computer what the coolant temperature actually is. If you're replacing one and searching through thermostats and HVAC control sensors, you'll see two very different price points-$16.80 for a sensor that follows a factory part-number fitment, and $1.99 for a multi-fit unit with a broad application list. Both are sold as direct-replacement parts. The right answer isn't just the cheaper one; it depends on whether your vehicle matches the specific reference or the cross-reference list. This head-to-head compares the two so you can decide whether the extra cost buys useful fitment confidence or unnecessary coverage.
Quick verdict
Choose the OEM 37870-RWC-A01 if you want a part tied to a specific OEM fitment and part-number reference. Choose the 12146312 if you want a flexible replacement and are comfortable matching interchange numbers yourself.
Price and fitment at a glance
| Product | Price | Fitment | Key details |
|---|---|---|---|
| OEM Engine Coolant Temperature Sensor For 2006-2025 Honda & Acura 37870-RWC-A01 | USD 16.80 | 2006-2025 Honda and Acura | Female connector, 19mm hex |
| 12146312 Engine Coolant Temperature Sensor Water Temp Sensor FOR Chevy GMC Honda | USD 1.99 | Chevy, GMC, Honda | 2-pin, copper/ABS body |
Where each product wins
The OEM 37870-RWC-A01 wins for owners who want a factory-style fit. It covers a published model-year range and gives you a specific part-number reference to check against your engine. That's helpful when you want the replacement to be tied to the original application rather than a cross-reference.
The 12146312 wins for flexibility. It lists a broad set of interchange numbers, including 12146312, 1236302, 1338450, and 15326386, so it can apply across more than one vehicle line. You get a wider net to match against your existing part.
Product notes
OEM Engine Coolant Temperature Sensor For 2006-2025 Honda & Acura 37870-RWC-A01
This is the part to pick when your vehicle falls inside the 2006-2025 Honda and Acura coverage listed for this sensor. It's tied to the 37870-RWC-A01 reference, and the female connector and 19mm hex are part of the design. It's made in Japan. The real catch is that the coverage is model-specific: if your car isn't one of the listed Honda or Acura models, the part's main advantage disappears. You'd be buying specificity you can't apply. For owners of the listed models, though, it's the easier choice to feel confident about.
12146312 Engine Coolant Temperature Sensor Water Temp Sensor FOR Chevy GMC Honda
The 12146312 is the low-cost play. It covers Chevrolet, GMC, and Honda applications, and the list of interchange numbers includes 12146312, 1236302, 1338450, and 15326386. The sensor is a two-pin unit with a copper and plastic ABS body. The biggest plus is flexibility: one part number covers a wider range of applications, so you may not need to look up a model-specific reference. The trade-off is that there is no model-year or engine list attached, so you need to check that your vehicle matches one of the OE numbers before installing. If you're comfortable doing that and want a low-cost replacement, this is the option that leaves money in your pocket.
Final choice by use case
For a listed vehicle in the 37870-RWC-A01 coverage, the OEM sensor gives you the most direct path to a confirmed fit. For a vehicle that matches one of the 12146312's interchange numbers, the 12146312 is the lower-cost way to go. The first prioritizes fitment certainty; the second prioritizes flexibility and price.
