NTK 21058 Oxygen Sensor - Downstream

Direct-Fit Downstream Oxygen Sensor

NTK Oxygen Sensor 21058 is a direct-fit heated oxygen sensor built for downstream monitoring on select GM, Hummer, Saab, and Isuzu applications. It uses a specific-fit, threaded design with a 4-wire layout and 15-inch wiring harness length for OE-style replacement on vehicles such as the Chevrolet Colorado, GMC Canyon, and Hummer H3.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific-fit design for direct replacement
• 4-wire configuration with 15-inch harness length
• 18 mm thread diameter and threaded mounting type
• Built to meet or exceed OE specifications during manufacturing
• Cross-references Bosch 15151 and DENSO Auto Parts 234-4294 for the same application

Product Line Details

NTK Direct Fit Oxygen Sensors are part of the brand’s OE-focused sensor line. NTK applies ceramic manufacturing expertise and application-specific engineering to deliver the correct fit, form, and function for import and domestic vehicles. Part number 21058 follows that approach with a direct-fit layout for downstream service replacement.

Fitment

• Fits 2007-2012 Chevrolet Colorado, Downstream B1S2 oxygen sensor meets OEM standards.
• Fits 2007-2012 GMC Canyon, Downstream B1S2 oxygen sensor meets OEM standards.
• Fits 2007-2010 Hummer H3, Downstream B1S2 oxygen sensor meets OEM standards.
• Fits 2009-2010 Hummer H3T, Downstream B1S2 oxygen sensor meets OEM standards.
• Fits 2007-2009 Chevrolet Trailblazer, Downstream B1S2 oxygen sensor meets OEM standards.
• Fits 2007-2009 GMC Envoy, Downstream B1S2 oxygen sensor meets OEM standards.
• Fits 2007-2009 Saab 9-7x, Downstream B1S2 oxygen sensor meets OEM standards.
• Fits 2007-2008 Isuzu Ascender, Downstream B1S2 oxygen sensor meets OEM standards.
• Fits 2007-2008 Isuzu i-290, Downstream B1S2 oxygen sensor meets OEM standards.
• Fits 2007-2008 Isuzu i-370, Downstream B1S2 oxygen sensor meets OEM standards.
• Fits 2007 Buick Rainier, Downstream B1S2 oxygen sensor meets OEM standards.

What It Helps Address

• Check engine light concerns related to downstream oxygen sensor performance
• Incorrect air-fuel feedback from a worn heated O2 sensor
• Emissions test failures tied to sensor response issues
• Rough exhaust monitoring caused by aging sensor elements
• OE replacement needs on Chevrolet Colorado, GMC Canyon, and Hummer H3 applications

Installation Notes

Verify the connector, thread size, and harness length before installation. This part uses a threaded mounting style and a 4-wire heated sensor design, so it should be matched to the original downstream location and wiring layout on the vehicle. Confirm the exact application by year, make, model, and position before ordering.

Quality Assurance

NTK manufactures oxygen sensors with OE-level application coverage and tests them during production to support fit and reliability that meet or exceed original equipment specifications. Part number 21058 is built for direct replacement service on the listed vehicles, including Chevrolet Colorado, GMC Canyon, and Hummer H3 applications.