NTK 21075 Oxygen Sensor - Downstream Left or Downstream Right

NTK 21075 Direct Fit Oxygen Sensor

NTK 21075 is a direct fit heated oxygen sensor built for specific downstream applications on select Chevrolet, GMC, and Cadillac trucks and SUVs. It is engineered for OE-style fit, form, and function, with application coverage that includes the Chevrolet Silverado 1500, GMC Sierra 1500, and Cadillac Escalade.

Key Features

• Specific-fit heated oxygen sensor for downstream left or downstream right locations
• 4-wire design with a 13.25 in. wiring harness length
• Threaded mounting type with 18.000 mm thread diameter
• Built for direct replacement service on select GM full-size trucks, vans, and SUVs
• NTK direct fit oxygen sensor line focuses on OE-style application coverage and ceramic sensor technology

Product Details

NTK 21075 is part of the Direct Fit Oxygen Sensor line, a product line focused on exact application coverage for import and domestic vehicles. NTK develops and manufactures oxygen sensors with control over the ceramic element from raw material through finished sensor, supporting consistent signal performance and fitment. This sensor is listed for downstream left and downstream right positions on 2014-2020 Chevrolet Silverado 1500, GMC Sierra 1500, 2015-2020 Cadillac Escalade, and related applications including Chevrolet Tahoe, GMC Yukon, Chevrolet Express, and GMC Savana models. It also cross-references DENSO Auto Parts 234-4974 for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Incorrect oxygen sensor readings after sensor aging or contamination
• Emissions system fault codes tied to B1S2 or B2S2 locations
• Rough emissions monitoring performance on GM trucks, vans, and SUVs
• Replacement needs for a direct fit oxygen sensor on Silverado 1500, Sierra 1500, and Escalade applications

Installation Notes and Tips

Verify the connector style, wire count, and downstream position before ordering. This NTK 21075 sensor is specific fit, so match the vehicle year, make, model, and bank/sensor location exactly. Confirm the threaded mounting point and harness length against the original sensor before installation. For 2016 Chevrolet Express 2500, Express 3500, GMC Savana 2500, and GMC Savana 3500 applications, note the oval connector listing in the fitment data.

Quality Assurance

NTK is the Sensor Specialist and the world’s largest supplier and manufacturer of original equipment oxygen sensors. The brand states that these sensors are extensively tested during manufacturing to support quality and reliability that meet or exceed OE specifications.