NTK 25155 Oxygen Sensor - Downstream Left, Downstream Right or Upstream

Overview of NTK Direct Fit Oxygen Sensor 25155

The NTK Direct Fit Oxygen Sensor 25155 is designed specifically for select Hyundai and Kia models, including the Magentis, Optima, Santa Fe, Sonata, and XG300. 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 activation and improved efficiency
• Specific fit for Hyundai and Kia vehicles for direct replacement
• Threaded mounting type with 18mm thread diameter for secure installation
• Four-wire configuration for reliable electrical connections
• 17.75-inch wiring harness length to accommodate factory routing

Details on the Direct Fit Oxygen Sensor Product Line

The NTK Direct Fit Oxygen Sensor line is engineered to provide exact fitment and function for specific vehicle applications. This product line focuses on delivering sensors that match OEM specifications, reducing installation time and ensuring compatibility. The 25155 part number is part of this line, offering a direct replacement solution for Hyundai and Kia models without the need for modifications.

Technical Description and Features

The NTK 25155 oxygen sensor features a heated sensor element that allows it to reach operating temperature quickly, improving emission control during cold starts. Its four-wire design supports both the sensor signal and heater circuit, ensuring consistent performance. The 18mm threaded mounting type provides a secure and leak-free fit in the exhaust system. With a wiring harness length of 17.75 inches, this sensor is designed to match the factory harness routing, simplifying installation.

Common Applications and Issues Addressed

• Restores accurate air-fuel ratio readings for Hyundai Magentis and Kia Optima engines
• Helps resolve check engine light triggers related to oxygen sensor faults
• Improves fuel efficiency and reduces emissions in Hyundai Sonata and Kia Santa Fe
• Addresses rough idling and poor engine performance caused by faulty sensors
• Ensures compliance with emission standards for Kia XG300 vehicles

Installation Notes and Tips

• Ensure the vehicle is cool before sensor removal to avoid burns
• Use an oxygen sensor socket or appropriate tool for removal and installation
• Do not over-tighten; torque to manufacturer specifications for the 18mm threaded sensor
• Check wiring harness length (17.75 inches) to confirm proper routing and connection
• Verify sensor compatibility with specific Hyundai and Kia models before installation

Quality Assurance and Warranty

NTK oxygen sensors, including the Direct Fit Oxygen Sensor 25155, are manufactured to meet OEM standards for durability and performance. While specific warranty details may vary, NTK products typically come with a limited warranty covering defects in materials and workmanship. This ensures reliable operation and peace of mind when replacing oxygen sensors on Hyundai and Kia vehicles.