NTK 21084 Oxygen Sensor

Direct-Fit Oxygen Sensor for GM Applications

NTK Oxygen Sensor 21084 is a direct-fit, specific-application replacement built for precise emissions control. It uses a heated, threaded design with a 4-wire configuration and an 18 mm thread diameter for a factory-style installation.

Compatible with Buick Enclave, Cadillac XT5, Cadillac XT6, Chevrolet Blazer, Chevrolet Traverse, Chevrolet Traverse Limited, GMC Acadia, Chevrolet Colorado, and GMC Canyon applications across the listed upstream and downstream positions. This part number 21084 is engineered for buyers who need an OE-style oxygen sensor with the correct fitment details already matched.

Key Features

• Direct-fit oxygen sensor for specific applications
• Heated sensor design for emissions system operation
• Threaded mounting type with 18 mm thread diameter
• 4-wire configuration with 12.25 in. harness length
• NTK Direct Fit Oxygen Sensor line for OE-style coverage

Fitment Details

• Fits 2021-2024 Buick Enclave, upstream right.
• Fits 2018-2020 Buick Enclave, upstream right.
• Fits 2018-2020 Buick Enclave, upstream left.
• Fits 2018-2020 Buick Enclave, downstream right.
• Fits 2018-2020 Buick Enclave, downstream left.
• Fits 2017-2020 Cadillac XT5, upstream right.
• Fits 2017-2020 Cadillac XT5, upstream left.
• Fits 2017-2020 Cadillac XT5, downstream right.
• Fits 2017-2020 Cadillac XT5, downstream left.
• Fits 2020 Cadillac XT6, upstream right.
• Fits 2020 Cadillac XT6, upstream left.
• Fits 2020 Cadillac XT6, downstream right.
• Fits 2020 Cadillac XT6, downstream left.
• Fits 2021-2024 Cadillac XT6, upstream right.
• Fits 2019-2020 Chevrolet Blazer, upstream right.
• Fits 2019-2020 Chevrolet Blazer, upstream left.
• Fits 2019-2020 Chevrolet Blazer, downstream right.
• Fits 2019-2020 Chevrolet Blazer, downstream left.
• Fits 2021-2024 Chevrolet Blazer, upstream right.
• Fits 2017-2020 Chevrolet Colorado, upstream right.
• Fits 2017-2020 Chevrolet Colorado, upstream left.
• Fits 2017-2020 Chevrolet Colorado, downstream right.
• Fits 2017-2020 Chevrolet Colorado, downstream left.
• Fits 2021-2022 Chevrolet Colorado, upstream right.
• Fits 2018-2020 Chevrolet Traverse, upstream right.
• Fits 2018-2020 Chevrolet Traverse, upstream left.
• Fits 2018-2020 Chevrolet Traverse, downstream right.
• Fits 2018-2020 Chevrolet Traverse, downstream left.
• Fits 2021-2023 Chevrolet Traverse, upstream right.
• Fits 2024 Chevrolet Traverse Limited, upstream right.
• Fits 2018-2020 GMC Acadia, upstream right.
• Fits 2018-2020 GMC Acadia, upstream left.
• Fits 2018-2020 GMC Acadia, downstream right.
• Fits 2018-2020 GMC Acadia, downstream left.
• Fits 2021-2023 GMC Acadia, upstream right.
• Fits 2017-2020 GMC Canyon, upstream right.
• Fits 2017-2020 GMC Canyon, upstream left.
• Fits 2017-2020 GMC Canyon, downstream right.
• Fits 2017-2020 GMC Canyon, downstream left.
• Fits 2021-2022 GMC Canyon, upstream right.

What It Helps Resolve

• Faulty oxygen sensor readings that can trigger emissions-related trouble codes
• Incorrect air-fuel feedback affecting engine management
• Slow sensor response in heated oxygen sensor circuits
• Replacement needs for threaded, direct-fit sensor locations
• Fitment issues when the original sensor uses a specific harness and connector layout

Installation Notes

Verify the vehicle year, make, model, and sensor position before ordering. This oxygen sensor uses a threaded mounting style and a specific 4-wire harness layout, so matching the application details is important for correct installation. Part number 21084 should be cross-checked against the original sensor location and connector configuration.

Quality Assurance

NTK is part of the NGK family of products and is a major original equipment oxygen sensor manufacturer. NTK states that these sensors are extensively tested during manufacturing to meet or exceed OE specifications, with fit, form, and function aligned to factory requirements. This part cross-references GM 12667438 for the same application.