NECATUO Oxygen Sensor O2 Sensor for Polaris RZR XP 1000 / XP4 1000 Turbo — OEM-fit Direct Replacement

NECATUO 4016021 is a direct-fit OEM-quality oxygen (O2) sensor engineered to restore accurate air-fuel readings on compatible Polaris RZR, General, Sportsman and select Indian Motorcycle models.

If your vehicle’s check engine light, rough idle, or decreased fuel economy point toward a failing O2 sensor, this NECATUO replacement is built to match OE fit and function while delivering reliable long-term operation. The sensor is manufactured from durable components to withstand off-road vibration, heat cycles, and the contaminants common in ATV/UTV use. It replaces part numbers 4013979 and 4016021 and fits a wide range of Polaris model years and variants—always verify fitment for your VIN before ordering.

Which vehicles will this NECATUO O2 sensor fit?

This sensor covers many Polaris and related models across multiple years. Fitment includes RZR XP 1000 and XP 4 1000 variants, General and Sportsman models, plus select Indian Motorcycle Chieftain/Roadmaster and Scout variants listed by the manufacturer. Check the vehicle list and any online fitment tool to confirm compatibility with your exact year and trim.

• Replaces OEM numbers 4013979 and 4016021 for cross-reference.
• Compatible with 2015–2019 RZR XP 1000, RZR XP 4 1000, and RZR XP 1000 Turbo models.
• Fits 2016–2019 General 1000, many Sportsman models, and select 2015–2016 Indian Motorcycle models.
• Always use VIN or fitment filter to confirm before purchase.

How does this sensor help engine performance and emissions monitoring?

The oxygen sensor provides the engine control unit (ECU) with crucial exhaust oxygen data so the fuel injection system can adjust the air–fuel ratio. A healthy sensor helps maintain stable idling, better throttle response, and more consistent fuel economy while enabling accurate emissions diagnostics. It’s not a cure-all but an essential component for the engine management system.

• Restores accurate oxygen feedback to the ECU for improved fueling decisions.
• Supports stable idle and throttle response when operating correctly.
• Helps maintain catalytic converter effectiveness by keeping mixtures near target.
• Enables proper emissions monitoring and diagnostic trouble code resolution.

Is installation difficult and what should I expect during replacement?

NECATUO builds this sensor to match original equipment geometry for straightforward installation using standard O2-sensor sockets. Basic mechanical skills and common tools are usually sufficient, though some models may require removal of heat shields or access panels. If you see persistent codes after install, a professional scan can verify wiring and ECU readiness.

• Designed to OE dimensions for plug-and-play mounting and wiring compatibility.
• Typical install requires an O2 sensor socket and moderate mechanical aptitude.
• May need heat shield or exhaust hardware removal on some models.
• If codes persist, check wiring harness connectors and ECU readiness with a scanner.

What distinguishes NECATUO’s sensor from cheaper alternatives?

NECATUO emphasizes durable construction and materials selected for long-term service in demanding conditions, which reduces the chance of premature failure in off-road or high-heat environments. The unit is tested for reliable voltage response and fitment accuracy to minimize installation hassles. It offers an economical replacement option without sacrificing core material quality.

• Manufactured to match OE fit, form and functional characteristics.
• Durable components aim to resist heat, vibration, and contaminants.
• Backed by part-number cross-reference for correct vehicle matching.
• Cost-effective alternative to dealership-priced OEM units.

Who is this for: The NECATUO 4016021 O2 sensor is intended for owners and mechanics of Polaris RZR, General, Sportman ATVs/UTVs and compatible Indian Motorcycle models who need a reliable replacement sensor that closely matches the original equipment. Choose this part if you want an economical, OE-dimensioned sensor to address check-engine-light codes, sluggish fueling behavior, or suspected sensor failure—just confirm fitment for your specific year and trim before purchase.