NTK 25197 Oxygen Sensor - Downstream Left or Downstream Right

Overview of NTK Direct Fit Oxygen Sensor 25197

The NTK Direct Fit Oxygen Sensor 25197 is designed specifically for select Audi models, including the A4 Quattro, A5 Quattro, A6 Quattro, A7 Quattro, A8 Quattro, Q5, S4, S5, and SQ5. This heated oxygen sensor ensures accurate emissions control and optimal engine performance by providing precise air-fuel mixture data to the vehicle's engine management system.

• Heated sensor type for faster warm-up and improved efficiency
• Specific fit for Audi Quattro models ensuring direct replacement
• Threaded mounting type with an 18mm thread diameter for secure installation
• 19.75-inch wiring harness length with 4 wires for reliable connectivity
• Part number 25197 for exact OEM compatibility

Details on the Direct Fit Oxygen Sensor Product Line

The NTK Direct Fit Oxygen Sensor line is engineered to provide precise fitment and reliable performance for specific vehicle applications. This product line focuses on delivering sensors that match OEM specifications, reducing installation time and ensuring proper function without the need for modifications. The 25197 sensor is part of this line, offering a direct replacement solution for various Audi Quattro models.

Technical Description and Features

The NTK 25197 oxygen sensor features a heated sensor element that allows it to reach operating temperature quickly, improving emission control efficiency shortly after engine start. The sensor’s 4-wire design supports both the heating element and signal transmission, ensuring accurate data delivery to the engine control unit. With a threaded mounting type and an 18mm thread diameter, installation is straightforward and secure. The 19.75-inch wiring harness length provides sufficient reach for proper connection without excess slack.

Common Applications and Issues Addressed

• Replacement for faulty or failing oxygen sensors in Audi A4 Quattro and related models
• Helps resolve engine performance issues caused by incorrect air-fuel mixture readings
• Reduces emissions by ensuring accurate oxygen level monitoring
• Addresses check engine light triggers related to oxygen sensor faults
• Improves fuel efficiency by providing precise sensor data to the ECU

Installation Notes and Tips

When installing the NTK 25197 oxygen sensor, ensure the vehicle is cool to avoid burns. Use an oxygen sensor socket or appropriate tool to remove the old sensor carefully. Verify the thread size matches the mounting port (18mm) and connect the 4-wire harness securely. Avoid twisting or damaging the wiring during installation. It is recommended to check for any diagnostic trouble codes after installation to confirm proper sensor operation.

Quality Assurance and Warranty

NTK oxygen sensors are manufactured to meet strict OEM standards for durability and performance. The Direct Fit Oxygen Sensor 25197 undergoes rigorous testing to ensure reliable operation under various driving conditions. While specific warranty details may vary, NTK typically offers coverage against defects in materials and workmanship. Consult product documentation or the supplier for exact warranty terms.