NTK 25688 Oxygen Sensor - Downstream Left

Direct-Fit Oxygen Sensor

NTK 25688 is a direct-fit heated oxygen sensor built for specific applications and engineered to match OE fit, form, and function. It uses a threaded mounting design and a 4-wire configuration for straightforward replacement in emission control systems.

• Direct-fit oxygen sensor for specific applications
• Heated sensor design for responsive exhaust monitoring
• 4-wire construction with threaded mounting
• 52.25-inch harness length for application-specific routing

Application Details

Fits 2011-2017 Porsche Cayenne, downstream left. Fits 2007-2010 Audi Q7, downstream left. Fits 2007-2009 Volkswagen Touareg, downstream left. This part cross-references Bosch (e.g., 16984, 16986) for the same application.

NTK 25688 is part of the Direct Fit Oxygen Sensor line, which focuses on application-specific coverage and OE-style replacement. NTK uses ceramic sensor technology and extensive manufacturing testing to support consistent fit and reliable signal performance.

What It Helps Address

• Fault codes related to oxygen sensor performance
• Incorrect exhaust oxygen readings
• Emissions test failures caused by a worn sensor
• Rough fuel control from inaccurate sensor feedback

Installation Notes and Quality

Use the threaded mounting style and harness length to confirm routing before installation. Verify the connector, wire count, and downstream left placement against the original part and vehicle service information. NTK states that these oxygen sensors are extensively tested during manufacturing to meet or exceed OE specifications.

NTK is a major original equipment oxygen sensor supplier and part of the NGK family of products, with coverage focused on import and domestic applications.

Part number: 25688.