NTK 21553 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Direct-Fit Oxygen Sensor

NTK Oxygen Sensor 21553 is a specific-fit, threaded oxygen sensor built for broad import and domestic coverage. It uses a non-heated, 2-wire design with a 13.7500 wiring harness length and 18.000 thread diameter for applications that require an OE-style replacement.

Compatible With select Daewoo, Cadillac, Buick, Chevrolet, Pontiac, Jeep, and other applications, this NTK oxygen sensor is part of the Direct Fit Oxygen Sensor line. The design focuses on correct fit, form, and function for vehicles that use an upstream sensor configuration.

Key Features

• Specific-fit oxygen sensor for direct replacement applications
• Non-heated sensor design with 2-wire construction
• Threaded mounting type with 18.000 thread diameter
• 13.7500 wiring harness length for application-specific routing
• OE-style fitment for upstream sensor locations

Detailed Description

NTK 21553 is engineered as a direct-fit oxygen sensor for a wide range of older vehicle applications, including Cadillac DeVille, Chevrolet Camaro, and Pontiac Firebird fitments. The sensor is built around NTK’s OE-focused manufacturing approach, with testing during production to help ensure quality and reliability that meet or exceed OE specifications. As an oxygen sensor, it supports air-fuel feedback in systems that rely on accurate exhaust monitoring.

This part cross-references Bosch 12028 and Delphi ES10003 for the same application.

What It Is Used For

• Replacing a failed upstream oxygen sensor
• Restoring air-fuel ratio feedback to the engine control system
• Addressing check engine light conditions tied to oxygen sensor faults
• Correcting drivability issues caused by inaccurate exhaust readings
• Replacing an OE-style sensor with the proper threaded, specific-fit design

Installation Notes and Tips

Verify the vehicle’s year, make, model, and sensor location before ordering. This sensor is a specific-fit, threaded unit, so matching the connector style, harness length, and upstream application is important for proper installation. Use the fitment notes to confirm the correct bank and sensor position for your vehicle.

Quality Assurance

NTK is a major original equipment oxygen sensor supplier and manufactures sensors with OE application technology. Each sensor is extensively tested during manufacturing to support quality and reliability that align with OE specifications.