GUZIKO O2 Oxygen Sensor for Honda TRX420 TRX500 (2014–2019) - Direct Fit, OE Replacement

GUZIKO O2 oxygen sensor is a direct-fit replacement for select Honda TRX420 and TRX500 2014–2019 models, restoring accurate exhaust oxygen readings for proper engine air-fuel control.

If your Honda Rancher, Foreman or Rubicon is showing rough running, poor fuel economy, or a check-engine light related to the oxygen sensor, this GUZIKO replacement is engineered to match the original equipment fit and electrical characteristics. It replaces OE part numbers 36531-HR3-A22 and 36531-HR3-A21 and is intended to plug into the factory harness for the listed model years.

Which Honda models and years will this sensor fit?

This GUZIKO O2 sensor is built to fit specific Honda four-wheelers produced between 2014 and 2019. Confirm your vehicle model and existing part number before ordering to ensure compatibility.

• Honda TRX420 Rancher: 2014, 2015, 2016, 2017, 2018, 2019
• Honda TRX500 Rancher: 2015, 2016
• Honda TRX500 Foreman: 2015, 2016, 2017, 2018, 2019
• Honda TRX500 Rubicon: 2015, 2016, 2017, 2018, 2019
• Replaces OEM numbers 36531-HR3-A22 and 36531-HR3-A21

How does this oxygen sensor affect engine performance?

The oxygen sensor measures exhaust oxygen content and sends voltage signals to the engine control unit so the ECU can adjust fuel delivery. A correctly working sensor helps the engine run smoothly, supports stable acceleration, and contributes to better fuel use.

• Provides real-time oxygen readings to the ECU
• Helps maintain optimal air-fuel mixture under varying loads
• Can reduce hesitation and rough idling caused by faulty sensors
• Supports consistent engine response and fuel efficiency

What are the build quality and durability features?

GUZIKO manufactures the sensor using heat-resistant materials and a design meant to withstand exhaust temperatures and road conditions. The unit undergoes quality checks before shipment to ensure electrical stability and long service life.

• High-temperature tolerant sensing element and housing
• Factory-style connector and wiring for secure fit
• Tested for signal stability and electrical continuity
• Packaged to protect the sensor during shipping

What should I know about installation, part numbers and after-sale support?

Installation instructions are not included; professional inspection and installation are recommended. Always verify the part number on your vehicle before purchasing and reach out to GUZIKO for support if you encounter issues.

• Double-check existing part number: 36531-HR3-A22 or 36531-HR3-A21
• No installation hardware or instructions are provided with the sensor
• GUZIKO offers a 12-month service warranty for functional issues
• Customer support response typically within 12 hours for after-sale questions

Who is this for: This GUZIKO O2 oxygen sensor is for ATV owners, mechanics and service shops maintaining Honda TRX420 or TRX500 models from the listed years who need a reliable, direct-fit replacement part. It’s suitable for riders seeking to restore proper engine control after a failed sensor or to replace a sensor indicated by diagnostic trouble codes. If you’re uncertain about fitment or installation, consult a professional technician to confirm compatibility and complete the installation safely.