NTK 21544 Oxygen Sensor

Direct Fit Oxygen Sensor Overview

NTK 21544 is a direct fit heated oxygen sensor built for specific applications in Chevrolet Camaro, Pontiac Firebird, and Cadillac models. It uses a threaded mounting design and a 4-wire heated configuration to match OE-style sensor placement and signal response.

As part of NTK's Direct Fit Oxygen Sensor line, this sensor is engineered for specific vehicle applications rather than universal use. The design focuses on correct fit, form, and function for emission control service.

Key Features

• Specific-fit oxygen sensor for targeted emission control applications
• Heated sensor design for faster operating response
• 4-wire construction for OE-style signal and heater circuit layout
• Threaded mounting type for direct replacement installation
• 16.75-inch wiring harness length for application-specific routing
• 18 mm thread diameter

Detailed Application Coverage

NTK 21544 covers multiple fitments across 1996-2002 Chevrolet Camaro, 1998-2002 Pontiac Firebird, and 1996-1999 Cadillac DeVille, Eldorado, and Seville applications. Fitment includes upstream and downstream positions, with notes that identify OE-equivalent design and sensor location details for the correct application match. This part number, 21544, is used for direct-fit replacement where the original sensor configuration matches the listed vehicle and position.

NTK's Direct Fit Oxygen Sensor line is backed by the brand's role as a major original equipment oxygen sensor supplier. The product line is built around OE application technology and manufacturing controls that support consistent fit and function across import and domestic coverage.

Common Replacement Reasons

• Check engine light related to oxygen sensor performance
• Slow or inaccurate air-fuel ratio feedback
• Heater circuit fault codes
• Emissions test failure caused by sensor degradation
• Rough idle or fuel trim issues tied to sensor response

Installation Notes

Verify the listed year, make, model, and sensor position before installation. Confirm the threaded mounting style, wire count, and harness length match the original sensor configuration. For best results, compare the existing sensor location and OE reference notes before replacing the part number 21544.

Quality Assurance

NTK states that these oxygen sensors are extensively tested during manufacturing to meet or exceed OE specifications. The brand also emphasizes OE application technology and original equipment-level fit, form, and function for emission control service.