NECATUO O2 Oxygen Sensor for Polaris RZR & Sportsman — 4016021 OEM Fit, Direct Replacement for 570/1000 Models

The NECATUO 4016021 oxygen (O2) sensor is a direct-fit replacement for specific Polaris RZR, Sportsman and other Polaris models that restores correct air-fuel sensing for the engine management system.

This OEM-quality sensor (also referenced as part numbers 4016021 and 4013979) is built to match original equipment specifications so you can replace a failing O2 sensor quickly and maintain engine performance and emission monitoring. NECATUO manufactures the unit from durable materials and designs it for straightforward installation where the factory sensor was originally mounted.

How will swapping to this NECATUO O2 sensor affect performance?

Replacing a worn or faulty oxygen sensor helps the engine control unit get accurate exhaust oxygen readings so fuel delivery and ignition timing can be adjusted as intended. While it’s not a performance upgrade, restoring correct sensor feedback often improves throttle response and fuel economy compared with a degraded sensor.

• Restores accurate air-fuel ratio feedback to the ECU
• Helps reduce rough idling caused by incorrect oxygen readings
• Supports consistent fuel trim adjustments and engine response

Is this NECATUO part compatible with my Polaris or Indian motorcycles?

This sensor is supplied to fit a wide range of Polaris vehicles and some Indian/other fits depending on year and model. Always cross-check your vehicle’s OE part number or use the site’s fitment filter before purchase to ensure it matches your application.

• Referenced OEM numbers: 4016021 and 4013979 for compatibility checks
• Common fits include RZR XP 1000, RZR XP 4 1000, Sportsman 570, General 1000 and several 2015–2019 Polaris models
• Verify year/model and engine variant with your vehicle’s parts manual or fitment tool

How difficult is installation and what should I prepare?

NECATUO builds this O2 sensor to match OE fit, form and function so it installs like the factory unit in most cases. Basic hand tools, an O2 sensor socket or a deep 7/8" socket, and appropriate safety precautions are typically all that’s needed.

• Disconnect battery and allow exhaust to cool before starting
• Use an O2 sensor socket or crowfoot to avoid damaging the connector or wiring
• Apply anti-seize (if recommended) to threads and torque to factory spec

What materials and quality features does the NECATUO sensor offer?

Manufactured from high-grade materials, this NECATUO sensor is designed for longevity and reliable signal generation under typical vehicle operating conditions. The construction aims to preserve the catalytic converter’s lifespan by ensuring accurate exhaust monitoring.

• OEM-style housing and connector for direct replacement
• Durable sensing element engineered for long service life
• Built to meet fit, form and function expectations of factory units

Who is this for: This NECATUO 4016021 O2 sensor is suited to owners and technicians of Polaris RZR, Sportsman, General and like-model vehicles who need a reliable, direct-replacement oxygen sensor. It’s aimed at DIY mechanics and professional shops requiring an OEM-spec part to restore proper exhaust sensing on compatible 2015–2019 model years and similar fits. Confirm your vehicle’s part number or use the fitment tool before ordering to ensure proper compatibility.