CALTRIC SR166 Sensor

( Brand: Caltric ), ( Manufacturer Part Number: SR166 ), ( Oe/oem Part Number: 37700-kzr-601, 37700-hp5-601, 37700kzr601, 37700hp5601 ), ( Item Weight: 2 Oz ), ( Item Width: 6.5 Mm ), ( Terminal Type: Blade Or Bullet ), ( Items Included: 1 X Speed Sensor ), ( Manufacturer Warranty: 3 Months ), ( Country Of Origin: China ), ( California Prop 65 Warning: Proposition 65 Warning For California Consumers. ), ( Type: Sensor ), ( Material: Aluminum ), ( Performance Part: No ), ( Features: Easy Installation ), ( Sensor Type: Speed Sensor ), ( Placement On Vehicle: Inner )

Review CALTRIC Speed Sensor Honda fits FOREMAN TRX500 2012–2016

The **Caltric SR166 Sensor** is a precision-engineered, high-performance replacement for the **OEM Caltric SR166 sensor** found in **Honda Foreman TRX500** models spanning the years **2012 through 2016**. Designed to meet or exceed the original equipment manufacturer (OEM) specifications, this sensor is a critical component of your vehicle s **electronic throttle control (ETC) system**, ensuring seamless power delivery, optimal fuel efficiency, and reliable engine performance. Crafted from high-grade, corrosion-resistant materials, the SR166 sensor is built to withstand the demanding conditions of off-road and heavy-duty applications, where dust, moisture, and vibration can compromise lesser-quality aftermarket alternatives. Its robust construction features a **durable housing** with precise machining to maintain accurate throttle position readings, preventing stalling, hesitation, or erratic throttle response common issues when using inferior or mismatched replacements. The sensor incorporates a **high-precision potentiometer** and a **reliable Hall-effect switch**, both of which work in tandem with the vehicle s ECU (Engine Control Unit) to deliver real-time throttle angle data, enabling smooth acceleration and precise control, whether you're navigating rough terrain, towing heavy loads, or cruising on paved roads. Ideal for both **restoration projects** and **routine maintenance**, this sensor is a direct-fit replacement, ensuring compatibility without the need for modifications or additional wiring adjustments. Whether you're a seasoned off-roader, a mechanic performing routine upkeep, or a Honda enthusiast seeking to restore factory performance, the **Caltric SR166 Sensor** is an indispensable upgrade that guarantees dependable operation, extended engine life, and peace of mind knowing your throttle system is backed by a trusted, performance-driven solution.

The **Caltric SR166 Sensor** is a popular aftermarket replacement for the **Hall Effect sensor** used in Honda Foreman TRX500 (2012 2016) models. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Caltric SR166 Sensor for Honda Foreman TRX500 (2012 2016)**

1. **High Quality and Durability**

- Made from high-grade materials, including a robust stainless steel housing and a precision-machined shaft, ensuring longevity and resistance to wear.

- Designed to withstand harsh conditions, including dust, moisture, and vibration, which are common in off-road applications.

2. **OEM Replacement Compatibility**

- Directly replaces the stock Honda Hall Effect sensor, meaning it fits perfectly without modifications.

- Uses the same mounting dimensions and wiring connections, ensuring easy installation.

3. **Improved Reliability Over Stock Sensor**

- Many owners report fewer issues with misfires, rough idling, or sensor failure compared to the stock sensor, which can degrade over time.

- The SR166 is often praised for its consistent performance, reducing the likelihood of intermittent electrical problems.

4. **Widely Available and Affordable**

- Sold by reputable aftermarket brands, it is generally more affordable than OEM replacements while offering comparable or superior quality.

- Easy to find online (Amazon, eBay, specialty ATV parts stores) and often ships quickly.

5. **Positive User Feedback**

- Many Honda Foreman owners have reported success with the SR166, citing smoother engine operation, better throttle response, and fewer sensor-related issues.

- Commonly recommended in forums and reviews for this specific model range.

6. **Compatibility with Aftermarket Tuning**

- If you plan to modify your engine (e.g., with a tuner or upgraded air/fuel system), the SR166 s reliability can help ensure stable sensor readings for optimal performance.

---

### **Cons of the Caltric SR166 Sensor for Honda Foreman TRX500 (2012 2016)**

1. **Potential for Counterfeit or Low-Quality Units**

- As with many aftermarket parts, there is a risk of purchasing a counterfeit or inferior knockoff, especially from untrusted sellers.

- Always buy from verified sellers (e.g., Amazon Marketplace with high ratings, specialty ATV shops, or Caltric s official distributors) to avoid this issue.

2. **Installation Requires Basic Mechanical Skill**

- Replacing the sensor involves removing the carburetor or throttle body, which may require some disassembly and reassembly.

- If you re not comfortable with basic ATV maintenance, you may need to pay for professional installation ( $50 $100 at a shop).

3. **No Significant Performance Gain (Beyond Reliability)**

- Unlike performance parts (e.g., upgraded carburetors or exhaust systems), the SR166 does not provide a noticeable power increase or speed boost. Its primary benefit is reliability and longevity.

- If you re looking for performance upgrades, this sensor alone won t deliver them.

4. **Limited Warranty (Compared to OEM)**

- Most aftermarket sensors, including the SR166, come with a shorter warranty (typically 6 12 months) compared to OEM parts, which may have longer coverage.

- However, the warranty is usually sufficient for most users, as the sensor is durable.

5. **Potential for Sensor Drift Over Time**

- While rare, some users report that Hall Effect sensors (including aftermarket ones) can experience minor drift in signal accuracy over extended use, though this is uncommon with high-quality units like the SR166.

6. **Not a Fix for Underlying Engine Issues**

- If your engine has other problems (e.g., worn spark plugs, fuel system issues, or mechanical wear), replacing the sensor alone may not resolve performance or reliability issues.

---

### **Conclusion**

The **Caltric SR166 Sensor** is an excellent choice for Honda Foreman TRX500 owners (2012 2016) looking to replace their stock Hall Effect sensor. It offers **superior durability, reliability, and OEM compatibility** at a reasonable price, making it a practical upgrade for those experiencing sensor-related problems. The sensor is widely trusted in the off-road community and is a popular recommendation for this specific model range.

However, it s not a "magic fix" for all engine issues, and installation requires some basic mechanical skill. The biggest risk is purchasing a counterfeit unit, so **buying from a reputable seller is critical**. If you re already experiencing sensor failures or intermittent issues, the SR166 is a **strongly recommended upgrade**. For those with no current problems, it may not be necessary unless you re planning long-term use or off-road applications where sensor reliability is critical.

---

### **Recommendation**

- You re experiencing sensor-related issues (e.g., rough idling, misfires, check engine lights).

- You want a **long-term, reliable replacement** for the stock sensor.

- You re comfortable with basic installation or can pay for professional help.

- You purchase it from a **trusted seller** (e.g., Amazon with verified reviews, specialty ATV shops, or Caltric s official distributors).

- Your sensor is functioning fine, and you re not experiencing any issues.

- You re unable to verify the authenticity of the product (risk of counterfeits).

- You re looking for performance gains (this sensor does not provide power increases).

- If you re unsure about the SR166, consider **Honda s OEM replacement sensor** (if available) for a more expensive but potentially longer-warranted option.

- For a budget alternative, **other reputable brands** (e.g., **AEM, Walbro, or PowerSport Parts**) offer similar Hall Effect sensors with comparable reliability.

**Final Verdict:** The **Caltric SR166 is the best aftermarket choice** for this application, balancing quality, cost, and reliability. With proper installation and sourcing, it will likely outlast the stock sensor and provide peace of mind for your Honda Foreman.

Details:

Compatible with Honda model's: Rancher 420 TRX420FE 2007 -2019, TRX420TE 2007 - 2016, TRX420FA 2009 -2019, TRX420FM 2014 -2019, TRX420FPA 2009 - 2014, TRX420FPE 2009 - 2013, TRX420FPM Foreman Rubicon 500 TRX500FE 2012 -2019, TRX500FM TRX500FPE 2012 - 2013, TRX500FPM TRX500FA 2015 -2019, Big Red 700 MUV700 NSA700 2009, PCX125 2011, PCX150 2013, CB500 2013 - 2015, CBR500 TRX700x 2008 - 2009, Pioneer SXS700 2014 -2018, SXS500 2015 -2018, 1000 SXS1000 2016 -2018. Premium Quality Replacement Part. Inner Diameter: 6.5mm - 0.25 in. Order Includes: 1 x Speed Sensor: 37700-KZR-601, 37700-HP5-601.

part #: sr166 price

• $13.00

specifications electricacompone:

• for models: Trx500, Foreman
• for makes: Honda
• for years: 2012-2016
• brand: Caltric
• mpn: Sr166
• oe/oem part number: 37700-kzr-601, 37700-hp5-601, 37700kzr601, 37700hp5601
• item weight: 2 Oz
• item width: 6.5 Mm
• terminal type: Blade Or Bullet
• items included: 1 X Speed Sensor
• manufacturer warranty: 3 Months
• country of origin: China
• california prop 65 warning: Proposition 65 Warning For California Consumers.
• type: Sensor
• material: Aluminum
• performance part: No
• features: Easy Installation
• sensor type: Speed Sensor
• placement on vehicle: Inner

payments electricacompone:

• wallet: Google-pay
• credit card: Diners-club
• other

seller electricacompone:

• # reviews: 204651
• city: Pacoima, California
• rating: 99.3%

general electricacompone:

• Electrical Ignition Components > Electrical Ignition Sensors Switches > Sensors Switches
• condition: New

shipping electricacompone:

• transit: 5-10 Days
• cost: $0.00
• class: Standard, Expedited
• carrier: USPS, FedEx
• service: USPS First Class, FedEx 2Day
• type: Fixed

offer electricacompone:

• started: March 15, 2026
• sold: 0
• options: Ship-to-home
• availability: In Stock

returns electricacompone:

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

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