HONDA 37870-KZR-601 Water Temperature Sensor

( Manufacturer Part Number: 37870-KZR-601 ), ( Type: Water Temperature Sensor ), ( Machine Type: Street Motorcycle ), ( Universal Fitment: No ), ( Country Of Origin: Japan )

Review HONDA Water Temperature Sensor fits CBR500RR 1925–2024

The **Honda 37870-KZR-601 Water Temperature Sensor** is a precision-engineered component designed exclusively for the **2024 and 2025 Honda CBR500RR**, ensuring optimal engine performance, reliability, and longevity. This high-quality temperature sensor plays a critical role in the bike s cooling system by monitoring the engine s coolant temperature in real time, allowing the ECU (Engine Control Unit) to make instantaneous adjustments to fuel delivery, ignition timing, and throttle response. Crafted from durable materials, including a robust metal housing and a sealed, corrosion-resistant probe, this sensor is built to withstand the demanding conditions of high-performance riding, from spirited track sessions to long-distance highway cruising. Its precise calibration ensures accurate temperature readings, preventing overheating while maintaining peak engine efficiency critical for maximizing power output and protecting internal components from thermal stress. Whether you're a seasoned rider upgrading for better performance or a maintenance-conscious owner ensuring long-term reliability, this **OEM-spec replacement sensor** delivers the same level of precision and dependability as the original equipment, making it an essential part of any CBR500RR s maintenance routine.

**Pros and Cons of buying a Honda 37870-KZR-601 (2024-2025 CBR500RR Water Temperature Sensor)**

1. **Direct Fitment** This sensor is specifically designed for the 2024 and 2025 Honda CBR500RR, ensuring compatibility without modifications. It will slot into the engine bay exactly as the original part did, reducing installation complexity.

2. **OEM Quality** As a genuine Honda part, it maintains the same build standards as the original equipment sensor. This means it should perform reliably, with proper sealing and durability, minimizing the risk of leaks or premature failure.

3. **Reliability** Honda s reputation for dependable components extends to sensors like this one. A high-quality sensor reduces the likelihood of false readings or sensor failure, which could lead to engine issues if ignored.

4. **Easy Replacement** Replacing a water temperature sensor is a straightforward task for most mechanics or DIY enthusiasts. The part is small, accessible, and typically requires only basic tools. This makes it a low-effort upgrade if the original sensor is faulty.

5. **Prevents Engine Damage** A failing water temperature sensor can lead to incorrect readings, potentially causing the engine to overheat or run inefficiently. Replacing it proactively safeguards the engine from unnecessary stress.

6. **Warranty Coverage** If purchased from an authorized dealer or Honda-approved seller, the sensor may come with a warranty, providing peace of mind against defects.

7. **Cost-Effective** Compared to the potential cost of engine damage from a failing sensor, replacing it is a minor expense. It s often cheaper than diagnosing intermittent issues caused by a bad sensor.

---

1. **Limited Availability** As a niche part for a specific model year, it may not be as widely stocked as more common Honda sensors. You might need to order it online or visit a specialized motorcycle parts dealer, which could take time.

2. **Price** While not excessively expensive, it is a premium part due to being OEM. If you re on a tight budget, you might consider aftermarket alternatives, though they may not always match the quality or longevity of the genuine Honda part.

3. **Installation Knowledge Required** Though simple, improper handling during installation (e.g., damaging the sensor tip or not sealing it properly) could lead to leaks or incorrect readings. If you re unsure, consulting a mechanic is advisable.

4. **Potential for Counterfeit Parts** Purchasing from unauthorized sellers increases the risk of receiving a fake or low-quality part. Always buy from reputable sources to avoid this issue.

5. **No Performance Upgrade** This sensor does not enhance performance; it simply replaces a faulty or worn-out component. If your sensor is functioning correctly, there s no need to replace it unless symptoms (e.g., overheating, erratic gauge readings) arise.

6. **Environmental Exposure** The sensor is exposed to coolant and engine heat, which can degrade it over time. Even a new sensor may eventually fail, requiring future replacement.

---

The Honda 37870-KZR-601 water temperature sensor is a practical and reliable choice for owners of the 2024-2025 CBR500RR experiencing sensor-related issues or planning routine maintenance. Its direct fitment, OEM quality, and ease of replacement make it a sound investment for ensuring engine health. However, its limited availability, potential cost, and the need for careful installation are factors to consider. If your sensor is failing or you re proactive about maintenance, this is a wise upgrade. If it s functioning fine, there s no urgent need to replace it.

---

- **Buy it if:** You re experiencing symptoms like overheating, incorrect temperature gauge readings, or a failing sensor. It s also a good idea to replace it as part of regular maintenance if you re unsure about its condition.

- **Avoid buying it if:** Your sensor is working correctly, and you re not experiencing any issues. In that case, there s no need to replace it unless you re planning a full service or upgrade.

- **Where to buy:** Purchase from an authorized Honda dealer, reputable online retailers (e.g., RockAuto, Cycle World, or Honda s official website), or trusted motorcycle parts stores to ensure authenticity and warranty coverage.

- **Installation:** If comfortable with basic mechanical work, replace it yourself. If not, consult a mechanic to avoid potential mistakes. Clean the sensor tip and ensure the gasket is properly seated to prevent leaks.

Details:

You can expect your calls, texts and messages to be answered within our open hours. Part brand: Genuine Honda part. See all pics-you get this exact item. Donor machine: 2025 CBR500R abs model with 1,326 miles.

Condition notes: Good condition. Mounted/tested fine.

part #: 37870kzr601 prices

• $9.13-$26.05

specifications cycleswitches:

• for models: Cbr500rr
• for makes: Honda
• for years: 1925-2024
• mpn: 37870-kzr-601
• type: Water Temperature Sensor
• machine type: Street Motorcycle
• universal fitment: No
• country of origin: Japan

offer cycleswitches:

• sold: 0
• options: Ship-to-home
• availability: In Stock
• quantity: 1
• started: February 4, 2026

returns cycleswitches:

• policy: Returns Accepted
• paid by: Buyer
• time: 30 Days

payments cycleswitches:

• credit card: Diners-club
• wallet: Apple-pay
• check
• cash
• other

seller cycleswitches:

• city: Union, Missouri
• rating: 99.9%
• # reviews: 34229

shipping cycleswitches:

• cost: $7.49
• service: USPS Ground Advantage, USPS Priority Mail
• carrier: USPS
• type: Fixed
• transit: 2-6 Days
• class: Standard, Expedited

general cycleswitches:

• Electrical Ignition Components > Electrical Ignition Sensors Switches > Ignition Key Switches
• condition: Used

Honda 37870-KZR-601 Is Similar To:

• 06380-hm8-305 Honda Oem Motor Cycle Angle Sensor Kit (32.4% similar) New old stock oem part KM8 note: shipping is free only in the lower 48 states. New angle sensor kit. Shipping is free to the lower 48 states. When you lean the blinkers go off. Please for shipping estimates to these locations...(November 10th, 2018)
• 500 Cb Sensor Map Flow Cb500f Cbr500 Maf Air Honda 136200-2640 Cb500 Mass 13 (16.3% similar) Map from a running 2013 CB500F which had 13,894 miles indicated on a working odometer. Location housefly. Good damage free working condition. Many parts fit the CBR500 but please be certain...(January 10th, 2015)
• 19063-mw0-000 Honda Oem Water Coolant Hose Connect Fitting Inlet (29.3% similar) It is a little dirty and discolored from previous use storage, but looks good. Honda CBR900RR water joint manufacturer: handcart: 19063-MW0-000 condition: used condition: this is a in good...(November 12th, 2018)
• 21-3432 Temperature Unit Water Sending Honda (38.8% similar) Sensor in its original box. Fast free shipping. New honda genuine water temp...(February 11th, 2019)
• 35160-mbw-d21 Oem Honda Bank Angle Sensor Tip Over Switch Cbr (26.7% similar) Less than 10 of items will receive in this rating b: part is excellent used condition, it may have normal use marks and other signs wear as should be expected. Absolutely no damage or issues. For comparison our entire rating system is disclosed. Removed from a great running driving handling bike. ...(August 14th, 2018)
• 35350-k26-901 Honda Grom Msx Rear Brake Light Switch Sensor (35.6% similar) ...(March 25th, 2018)
• 35700-gz4-305 Honda Oem Ez Cub Kick Side Stand Switch Set Sensor (27.6% similar) Its in unknown working condition, never tested. The side stand switch set was removed from a 1991 EZ90. It will fit EZ90. Any question feel free to ask...(June 26th, 2018)
• 35700-kzz-901 Honda Crf Kick Stand Safety Switch Sensor (33.3% similar) All used items are working unless stated as not or for parts only. If you do not feel can please to resolve the problem. Or find any damage. This may result in the malfunction of parts or vehicle. Fast response times...(March 20th, 2019)
• 35700-mz7-305 Honda Interceptor Vfr Side Stand Switch Kickstand Sensor Vf (31.8% similar) Came off a good running bike. Buyer pays return shipping...(May 10th, 2018)
• 35759-hn2-a21 Honda Foreman Year Gear Position Sensor (26.8% similar) These are manufacturer part numbers. Honda foreman 4X4 TRX500FA. Please view all photos, and reference the parts numbers when provided in listing. If there are any specific questions regarding an item please feel free to prior purchasing. Shipping prices may vary due to location. Some items may need...(February 11th, 2019)
• 36531-kzz-j01 Honda Crf Sensor (33.7% similar) This may result in the malfunction of parts or vehicle. All used items are working unless stated as not or for parts only. Fast response times. Or find any damage. If you do not feel can please to resolve the problem...(March 20th, 2019)