NTK 25727 Oxygen Sensor

Direct Fit Oxygen Sensor for OE-Style Replacement

NTK 25727 is a direct fit heated oxygen sensor built for specific applications that require OE-equivalent fit, form, and function. It is designed for downstream service on a range of import and domestic vehicles, including Chevrolet Cruze, Chevrolet Sonic, Buick Encore, and Chevrolet Trax applications.

As part of NTK’s Direct Fit Oxygen Sensor line, this sensor uses application-specific engineering to match original mounting and connector requirements. The result is a replacement oxygen sensor that aligns with factory specifications for the vehicle platform.

Key Features

• Heated oxygen sensor for faster operating readiness
• Specific fit design for direct replacement service
• 4-wire configuration
• Threaded mounting type with 18 mm thread diameter
• 15.75 in. wiring harness length
• OE-equivalent design for downstream and selected upstream applications
• Built by NTK, a major original equipment oxygen sensor manufacturer

Product Details

NTK 25727 is engineered for vehicles that require a direct fit oxygen sensor with the correct connector, thread size, and harness length. NTK develops its oxygen sensors using controlled ceramic manufacturing and extensive production testing to help maintain consistent sensor performance and reliability. This part number is used across multiple platforms, including Chevrolet Cruze, Chevrolet Sonic, Buick Encore, and Chevrolet Trax, as well as select Cadillac, Saab, Pontiac, Porsche, Saturn, and Buick applications.

This part cross-references Bosch 16378 and DENSO Auto Parts 234-4528 for the same application.

What This Oxygen Sensor Helps Address

• Check engine light concerns related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn downstream or upstream sensor
• Slow sensor response caused by age, heat, or contamination
• Emissions test failures tied to sensor signal issues
• Factory-fit replacement needs on OE-style exhaust sensor locations

Installation Notes and Fitment

Install as a threaded oxygen sensor in the original sensor location. Confirm the vehicle position before ordering, since fitment includes downstream, upstream, downstream right, downstream left, upstream right, and upstream left applications. Fits 2011-2015 Chevrolet Cruze, downstream; fits 2012-2020 Chevrolet Sonic, downstream; fits 2013-2020 Buick Encore, downstream; and fits 2013-2020 Chevrolet Trax, downstream.

• Fits 2021 Buick Encore, downstream
• Fits 2021 Chevrolet Trax, downstream
• Fits 2016 Chevrolet Cruze Limited, downstream
• Fits 2011 Chevrolet Cruze, downstream
• Fits 2010-2011 Cadillac SRX, upstream and downstream
• Fits 2011 Saab 9-4X, upstream and downstream
• Fits 2011 Saab 9-5, upstream
• Fits 2008-2009 Pontiac G8, downstream right and downstream left
• Fits 2006-2009 Saab 9-3, downstream
• Fits 2003-2004 Cadillac CTS, upstream right, upstream left, downstream right, and downstream left
• Fits 2003-2004 Porsche Boxster, upstream and downstream
• Fits 2002-2003 Saturn Vue, upstream right, upstream left, downstream right, and downstream left

Quality Assurance

NTK is part of the NGK family of products and is recognized as a major original equipment oxygen sensor manufacturer. Each sensor is manufactured and tested to meet or exceed OE specifications for fit and reliability.