NTK 21002 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

NTK Direct Fit Oxygen Sensor 21002

NTK Direct Fit Oxygen Sensor 21002 is a specific-fit, non-heated oxygen sensor built for upstream air/fuel ratio monitoring on a wide range of import and domestic vehicles. It is engineered for direct replacement service on applications such as Chevrolet Malibu, Pontiac Grand Am, and GMC Sierra-era platforms listed in the fitment data.

Key Features

• Direct fit oxygen sensor for specific vehicle applications
• Non-heated sensor design with 1-wire configuration
• Threaded mounting type with 18 mm thread diameter
• 15.25 in. wiring harness length for OE-style routing
• Built by NTK, a major original equipment oxygen sensor manufacturer
• Part number 21002 for catalog and cross-reference lookup

Product Details

NTK’s Direct Fit Oxygen Sensor line is focused on OE-style replacement coverage, fit, form, and function. NTK controls ceramic production from raw material through finished sensor, and each oxygen sensor is extensively tested during manufacturing to help meet or exceed OE specifications. Part number 21002 is designed for upstream locations, including Bank 1 Sensor 1 applications and select upstream left or right positions where listed. This part cross-references Bosch 12014 and Delphi ES10966 for the same application.

Fitment coverage includes long-tail search applications such as Fits 1997-1998 Chevrolet Malibu, Upstream; Fits 1986-1998 Chevrolet Cavalier, Upstream; Fits 1991-1998 GMC Sonoma, Upstream; and Fits 1995-1998 Pontiac Sunfire, Upstream. It also covers many Chevrolet, GMC, Pontiac, Buick, Oldsmobile, Isuzu, and Jeep models across the 1983-1999 range.

Common Problems This Sensor Can Address

• Faulty upstream oxygen sensor readings
• Check engine light concerns related to air/fuel ratio monitoring
• Rough idle or drivability issues tied to incorrect exhaust feedback
• Emissions test failures caused by a worn sensor
• Incorrect fuel control from an aging OE-style sensor

Installation Notes and Tips

Verify the vehicle year, make, model, engine configuration, and sensor position before ordering. This NTK oxygen sensor is a specific-fit threaded sensor, so confirm the upstream location and harness routing match the original part. For best results, inspect the connector, exhaust threads, and surrounding wiring before installation.

Quality Assurance

NTK is the Sensor Specialist and a leading original equipment oxygen sensor manufacturer. The brand’s manufacturing process emphasizes ceramic control, OE application coverage, and testing designed to support reliable replacement performance on import and domestic vehicles.