NTK 21054 Oxygen Sensor - Upstream

Direct Fit Oxygen Sensor for OE Replacement

The NTK 21054 direct fit oxygen sensor is a heated, specific-fit replacement built for upstream Bank 1 Sensor 1 applications. It is engineered for the 2004-2005 Buick Rainier, Chevrolet Colorado, Chevrolet Trailblazer, Chevrolet Trailblazer EXT, GMC Canyon, GMC Envoy, GMC Envoy XL, GMC Envoy XUV, Isuzu Ascender, 2005 Saab 9-7x, and 2004 Oldsmobile Bravada.

As part of NTK’s Direct Fit Oxygen Sensor line, this sensor is made for straightforward OE-style replacement on import and domestic vehicles. The NTK 21054 uses a threaded mounting design, 4-wire configuration, and 18.7500-inch wiring harness length to match the original application layout.

Key Features

• Heated oxygen sensor for upstream Bank 1 Sensor 1 placement
• Specific fit design for direct replacement on listed vehicles
• 4-wire configuration for OE-style signal and heater circuit setup
• 18.000 thread diameter with threaded mounting type
• 18.7500-inch wiring harness length
• NTK direct fit construction for application-specific replacement

Product Details

NTK is a major original equipment oxygen sensor manufacturer, and the 21054 reflects that OE-focused approach with fit, form, and function aligned to the original sensor location. The sensor is manufactured with ceramic technology and tested during production to help meet or exceed OE specifications for quality and reliability. For buyers searching for an upstream oxygen sensor for a 2004-2005 Chevrolet Trailblazer, GMC Envoy, or Buick Rainier, this part number provides a direct-fit replacement path without universal adaptation.

This part cross-references Bosch 13847 and DENSO Auto Parts 234-4119 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback from a failing upstream sensor
• Slow sensor response affecting fuel control
• Rough idle or drivability issues tied to sensor signal degradation
• Emission test failures caused by a worn oxygen sensor

Installation Notes and Tips

Install the NTK 21054 in the upstream Bank 1 Sensor 1 position only on the listed applications. Confirm connector style, harness routing, and threaded mounting before installation, and verify the vehicle year, make, and model against the fitment list. For search accuracy, this oxygen sensor is a direct-fit replacement for 2004-2005 Chevrolet Colorado and 2004-2005 GMC Canyon upstream applications, as well as the other listed GM and Saab vehicles.

Quality Assurance

NTK manufactures oxygen sensors with OE application coverage and production testing focused on fit and reliability. The brand’s OE supplier background and ceramic manufacturing expertise support consistent sensor performance for the NTK 21054.