NTK 25636 Oxygen Sensor - Upstream

Direct Fit Oxygen Sensor

NTK 25636 is a direct fit oxygen sensor built for specific applications and engineered for threaded installation. It uses a heated, 3-wire design with a 58.75-inch harness and an 18 mm thread diameter for the specified fitment.

• Heated oxygen sensor design for precise exhaust feedback.
• Specific-fit construction for direct application matching.
• Threaded mounting with 18 mm thread diameter.
• 58.75-inch wiring harness for the listed application.

Fitment Details

Compatible with 1994 Saab 9000, upstream. This NTK oxygen sensor is listed for Bank 1 Sensor 1 air/fuel ratio monitoring on the 1994 Saab 9000, and the NTK 25636 part number should be matched to the exact application shown.

NTK is known as a sensor-focused brand within the NGK family, with oxygen sensor manufacturing centered on OE-level fit, form, and function. The 25636 is part of the Direct Fit Oxygen Sensor line, which is organized to simplify application matching across import and domestic coverage.

What It Helps Address

• Fault codes related to oxygen sensor performance.
• Incorrect air/fuel ratio readings from a worn sensor.
• Slow sensor response in heated exhaust monitoring systems.
• Fitment issues from using a universal sensor instead of a specific-fit unit.

Installation Notes

Use the threaded mounting style and harness length shown for the listed application. Confirm connector style, sensor location, and thread size before installation. Match the NTK 25636 to the exact vehicle and position shown in the fitment data.

Quality Assurance

NTK states that its oxygen sensors are extensively tested during manufacturing to meet or exceed OE specifications. The brand also positions itself as a major original equipment oxygen sensor supplier, with ceramic-based manufacturing expertise supporting product consistency.