NTK 27066 Air / Fuel Ratio Sensor - Upstream

Direct-Fit Air/Fuel Ratio Sensor

NTK 27066 is a specific-fit, heated air/fuel ratio sensor built for upstream applications. It uses a 5-wire design and is engineered for direct replacement service on select Chevrolet Malibu and Buick Regal models.

Key Features

• Direct-fit replacement for specific applications
• Heated sensor design for faster operating response
• 5-wire configuration for the listed OE-style setup
• 18 mm thread diameter with 0.38 thread length
• 13.25 in. wiring harness length

Fitment Details

Compatible with select Chevrolet Malibu and Buick Regal applications. Fits 2021-2022 Chevrolet Malibu, upstream. Fits 2016-2020 Chevrolet Malibu, upstream. Fits 2018-2020 Buick Regal Sportback, upstream. Fits 2018-2020 Buick Regal TourX, upstream. Part number 27066 is listed for these upstream oxygen sensor applications, and the OE cross-reference is 12669867.

What It Helps Address

• Check engine lights related to air/fuel ratio sensor faults
• Incorrect sensor response from a worn heated sensor
• Driveability issues tied to inaccurate exhaust feedback
• Emissions concerns caused by a failing upstream sensor

Installation Notes and Tips

Use the vehicle year, make, model, and upstream position to confirm application before ordering. The specific-fit design is intended for direct replacement service, and the 5-wire connector layout should match the original sensor configuration. Verify thread size and harness length against the OE unit during installation.

Quality Assurance

NTK is part of the NGK family of products and is a major original equipment oxygen sensor supplier. NTK 27066 is manufactured and tested to meet or exceed OE specifications for fit, form, and function.