NTK 21006 Oxygen Sensor

Direct Fit Oxygen Sensor for OE Replacement

The NTK Direct Fit Oxygen Sensor 21006 is a heated, specific-fit oxygen sensor built for direct replacement on a wide range of import and domestic vehicles. It is engineered for OE-style fit, form, and function, with a 4-wire design and threaded mounting for straightforward service on the correct application.

NTK is known as a sensor specialist and is the world’s largest supplier and manufacturer of original equipment oxygen sensors. The 21006 reflects that OE-focused approach with manufacturing controls that help deliver consistent performance for vehicles such as Chevrolet Corvette, GMC Yukon, and Isuzu Rodeo applications.

Key Features

• Direct Fit Oxygen Sensor, part number 21006
• Heated sensor design for faster operating readiness
• Specific fit application for the listed vehicles
• 4-wire configuration with 18 mm thread diameter
• 13.7500 wiring harness length
• Threaded mounting type for OE-style installation
• Built to meet or exceed OE specifications during manufacturing

Detailed Product Overview

NTK 21006 is designed as an OE replacement oxygen sensor for upstream and downstream positions across many GM, Honda, Acura, Buick, Cadillac, GMC, Oldsmobile, Pontiac, and Isuzu models. It is a practical choice when replacing a failing sensor on applications such as Chevrolet Corvette upstream left or right, GMC Yukon upstream left or right, and Isuzu Rodeo downstream.

This part cross-references Bosch 15703 and DENSO Auto Parts 234-4012 for the same application. If you are searching for an oxygen sensor for a 1996-2000 Honda Passport, 1998-2001 Chevrolet Blazer, or 1999-2001 Isuzu VehiCROSS, this NTK direct fit sensor is listed for the specified positions in the fitment data.

What It Helps Address

• Check engine light caused by oxygen sensor failure
• Incorrect air/fuel ratio readings
• Reduced fuel economy from a worn sensor
• Rough idle or drivability issues tied to sensor signal loss
• Emissions test failures related to sensor performance

Installation Notes and Tips

Verify the exact year, make, model, and sensor position before ordering. This NTK 21006 is a specific-fit oxygen sensor, so the listed upstream and downstream applications must match the vehicle configuration. Confirm the 4-wire connector style, threaded mounting location, and harness length against the original sensor before installation.

For best results, inspect the exhaust system and wiring for damage before replacing the sensor. On vehicles such as Chevrolet Express, GMC Savana, and Chevrolet S10 applications, confirm whether the sensor location is upstream left, upstream right, or downstream as listed in the fitment table.

Quality Assurance

NTK uses OE-focused manufacturing and extensive testing to help ensure the sensor meets or exceeds original equipment specifications. As part of the NGK family of products, NTK applies ceramic and sensor manufacturing expertise to support reliable fit and function across import and domestic applications.