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SKU: 21549
NGK NTK 21549 Direct Fit Oxygen Sensor Chevrolet Avalanche 2500 (2003-2006)
Engineered by NTK, the world’s largest supplier of OEM oxygen sensors, this sensor is the top choice for drivers seeking unmatched reliability and superior engine performance. Designed specifically for the 2003-2006 Chevrolet Avalanche 2500, the NGK 21549 outperforms all competitors, delivering faster response times, reduced emissions, and optimal fuel efficiency. Trust NTK’s cutting-edge ceramic technology and rigorous testing to keep your vehicle running at its peak, making this the best oxygen sensor for your Avalanche.
Why NGK?
Performance: Features NTK’s premier technical ceramic sensing element with an integrated heater for rapid activation, reaching optimal operating temperature in seconds. This ensures quicker closed-loop control and significantly reduces cold-start emissions compared to Bosch, Denso, or AC Delco alternatives.
Durability: Platinum-coated for maximum longevity and equipped with a corrosion-resistant housing to protect against silicone and lead poisoning, outperforming cheaper aftermarket options.
Precision Fit: Direct-fit design with OE-style connectors and pre-coated threads for seamless, no-modification installation—saving you time and hassle.
Emissions Compliance: Meets or exceeds OEM specifications, guaranteeing smog test compliance and minimizing harmful emissions for eco-conscious drivers.
Trusted by Manufacturers: NGK/NTK is the preferred choice of GM, Ford, and Chrysler, with a legacy of innovation since 1936, making it the most reliable brand for your Avalanche.
Included:
- 1 NGK NTK 21549 Oxygen Sensor: Direct-fit, 4-wire configuration with a 16.5-inch (420mm) wire length for precise fitment.
- OE-Style Connector: No cutting or splicing required, ensuring a plug-and-play installation.
- Protective PTFE Filter: Allows atmospheric oxygen to enter while blocking water and engine contaminants, enhancing sensor longevity.
- Pre-Coated Threads: Simplifies installation and ensures a secure fit.
- Comprehensive Fitment Guide: Verified compatibility with your vehicle’s make, model, and year.
Part Number and Vehicle Fitment Details
- Part Number: NGK/NTK 21549
- Interchange Part Numbers: 234-4669, 15282, 12572705, 12600893, 12611870, 12617332, 8126008930
- Compatible Vehicles:
- Chevrolet Avalanche 2500 (2003-2006, 8.1L V8, Downstream or Upstream positions, depending on configuration)
- Cadillac Escalade (2003-2006, 6.0L V8, Downstream)
- Chevrolet Silverado 1500/2500/3500 (2003-2007 Classic, 6.0L or 8.1L V8, Downstream or Upstream)
- GMC Sierra 1500/2500/3500 (2003-2007 Classic, 6.0L or 8.1L V8, Downstream or Upstream)
- GMC Yukon XL 1500/2500 (2003-2006, 6.0L or 8.1L V8, Downstream)
- Hummer H2 (2003-2006, 6.0L V8, Downstream)
- Position: Primarily Downstream (post-catalytic converter), but may fit Upstream positions depending on vehicle configuration. Verify fitment with your vehicle’s OEM number and position.
Installation and Compatibility Notes
Easy Installation: Direct-fit design requires no special tools. Simply replace the existing sensor in its original position, ensuring the plug and wire length match your OEM sensor.
Fitment Caution: Confirm compatibility using your vehicle’s year, make, model, engine size, and OEM part number. For Avalanche 2500, check whether the sensor is for Upstream (pre-catalytic converter) or Downstream (post-catalytic converter) applications.
Torque Specification: Install with a torque of 65±2N for optimal sealing and performance.
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