NTK 25574 Oxygen Sensor - Upstream

Direct-fit oxygen sensor

The NTK 25574 is a heated, threaded oxygen sensor built for specific applications with direct-fit installation. It is engineered for Volkswagen Golf and Volkswagen Jetta upstream locations where OE-equivalent fit, form, and function are required.

Key features

• Heated oxygen sensor for faster operating response
• Specific-fit design for direct replacement applications
• Threaded mounting type with 18 mm thread diameter
• 3-wire configuration with 38.7500 harness length
• NTK 25574 part number for application matching

Detailed application coverage

Fits 1991-1992 Volkswagen Golf, upstream. Fits 1991-1992 Volkswagen Jetta, upstream. Additional Volkswagen Jetta coverage includes 1991 upstream applications with California emissions notes, plus 1987-1990 upstream applications with OE-equivalent design notes. This NTK oxygen sensor is part of the Direct Fit Oxygen Sensor line, which focuses on application-specific replacement parts built to streamline selection and maintain OE-style fit and function. The 25574 is a practical choice for restoring accurate exhaust feedback in import applications, and the NTK 25574 reference helps confirm the correct sensor for the listed Volkswagen Golf and Volkswagen Jetta fitments.

Common replacement concerns

• Check engine light caused by a failing oxygen sensor
• Slow sensor response affecting air-fuel control
• Incorrect exhaust feedback from a worn heated sensor
• Fitment issues when replacing a threaded upstream sensor

Installation notes and quality

Verify the vehicle year, emissions configuration, chassis break, and upstream position against the fitment notes before installation. Confirm the 3-wire layout, threaded mounting style, and harness length match the original sensor. NTK states these oxygen sensors are extensively tested during manufacturing to meet or exceed OE specifications, and the brand is recognized as a major original equipment oxygen sensor supplier.