NTK 21068 Oxygen Sensor - Downstream

NTK Direct Fit Oxygen Sensor 21068

NTK Direct Fit Oxygen Sensor 21068 is a heated, threaded oxygen sensor built for specific-fit replacement in select GM applications. It is engineered for downstream use and matches OE-style fitment for vehicles such as the Chevrolet Equinox, GMC Terrain, and Chevrolet Captiva Sport.

As part of NTK’s Direct Fit Oxygen Sensor line, this sensor reflects the brand’s focus on OE application coverage, ceramic-based sensor manufacturing, and fit, form, and function that align with original equipment requirements. If you are replacing a downstream sensor on a Chevrolet Equinox or GMC Terrain, part number 21068 provides a direct-fit service option.

Key Features

• Heated oxygen sensor for downstream placement
• Specific-fit design for direct replacement
• 4-wire configuration
• Threaded mounting type with 18 mm thread diameter
• 12.25 in. wiring harness length
• OE-style application coverage for select Chevrolet, GMC, and Captiva Sport models

Fitment Details

• Fits 2011-2017 Chevrolet Equinox, downstream; B1S2 oxygen sensor meets OEM standards.
• Fits 2011-2017 GMC Terrain, downstream; B1S2 oxygen sensor meets OEM standards.
• Fits 2011-2015 Chevrolet Captiva Sport, downstream; B1S2 oxygen sensor meets OEM standards.

Detailed Description

NTK 21068 is a direct-fit oxygen sensor for downstream exhaust monitoring on select 2011-2017 Chevrolet Equinox and GMC Terrain models, plus 2011-2015 Chevrolet Captiva Sport applications. The heated design helps the sensor reach operating temperature quickly, while the threaded mounting style and specific-fit configuration support OE-style replacement service. This part cross-references Bosch 15151 for the same application.

NTK manufactures oxygen sensors with controlled ceramic technology and extensive production testing to help maintain quality and reliability that meet or exceed OE specifications. For technicians and owners searching for a downstream oxygen sensor for Chevrolet Equinox, GMC Terrain, or Captiva Sport, part number 21068 is a direct replacement option built around original-equipment requirements.

Common Replacement Reasons

• Check engine light related to downstream oxygen sensor performance
• Fault codes tied to air-fuel ratio monitoring
• Reduced fuel economy from inaccurate exhaust feedback
• Failed emissions inspection caused by sensor malfunction
• Rough running or drivability issues linked to exhaust sensor data

Installation Notes

Confirm the downstream position and connector routing before installation. Match the 4-wire heated sensor layout, 18 mm thread diameter, and 12.25 in. harness length to the original part. Verify the vehicle application by year, make, model, and sensor position before replacing the sensor.

Quality Assurance

NTK is a major original equipment oxygen sensor manufacturer with broad OE application coverage. This Direct Fit Oxygen Sensor line is manufactured and tested to support OE-level fit and performance expectations for the listed applications.