NTK 21510 Oxygen Sensor - Downstream Left

Direct Fit Oxygen Sensor for GM Trucks and SUVs

NTK Oxygen Sensor 21510 is a direct fit, heated oxygen sensor built for specific downstream left applications on select Chevrolet Silverado, Suburban, and GMC Sierra and Yukon XL models. It uses a 4-wire design with a threaded mounting style and an 18 mm thread diameter for OE-style replacement on the listed vehicles.

Key Features

• Direct Fit Oxygen Sensor for specific applications
• Heated sensor design for faster operating response
• 4-wire configuration
• 21.75 in. wiring harness length
• 18 mm threaded mounting type
• Built for downstream left placement on listed GM trucks and SUVs
• NTK part number 21510

Product Details

NTK is known for oxygen sensor manufacturing across import and domestic coverage, and this Direct Fit Oxygen Sensor line is built around OE application data and ceramic technology control from raw material through finished sensor. Part number 21510 is engineered for the downstream left position on select 1999-2001 Chevrolet Silverado 2500, 2001 Chevrolet Silverado 1500 HD, Silverado 2500 HD, Silverado 3500, 2000-2001 Chevrolet Suburban 2500, 2001 GMC Sierra 1500, Sierra 1500 HD, Sierra 2500 HD, Sierra 3500, and 2001 GMC Yukon XL 1500, plus 2000-2001 Yukon XL 2500 applications. This NTK 21510 oxygen sensor is a direct replacement choice when you need OE-style fit, form, and function for the listed GM platforms.

This part cross-references Bosch 13029 and DENSO Auto Parts 234-4024 for the same application.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback from a worn downstream sensor
• Slow sensor response after extended service life
• Fault codes tied to heater circuit or sensor signal issues
• Emissions testing failures caused by a degraded oxygen sensor

Installation Notes and Tips

Confirm the downstream left location before ordering, since this sensor is specific to the listed applications. Match the 4-wire connector style, threaded mounting point, and harness length to the original sensor on your Chevrolet Silverado, GMC Sierra, or Yukon XL. Inspect the exhaust threads and wiring routing before installation to help ensure a proper seal and stable signal connection.

Quality Assurance

NTK manufactures oxygen sensors with extensive testing during production to support quality and reliability that meet or exceed OE specifications. As part of the NGK family of products, NTK focuses on OE application coverage and sensor technology for domestic and import vehicles.