NTK 25181 Oxygen Sensor - Downstream Left

Overview of NTK Direct Fit Oxygen Sensor 25181

The NTK Direct Fit Oxygen Sensor 25181 is designed specifically for select Hyundai and Kia models, including the Sonata, Santa Fe, Optima, and Sportage. This heated oxygen sensor features a threaded mounting type and a precise 18mm thread diameter, ensuring a secure and accurate fit for your vehicle's emission control system.

• Heated oxygen sensor for faster warm-up and improved efficiency
• Specific fit for Hyundai and Kia models such as Magentis, Tiburon, Tucson, and more
• Threaded mounting with 18mm thread diameter for reliable installation
• Four-wire design for accurate sensor signal and heater control
• 18-inch wiring harness length to accommodate factory routing

Detailed Product Description

The NTK Direct Fit Oxygen Sensor 25181 is engineered to meet the exact specifications of your vehicle’s original equipment. Its heated sensor type allows for quicker activation, reducing emissions during cold starts. The four-wire configuration supports both the sensor signal and the integrated heater circuit, which helps maintain optimal sensor temperature. With an 18mm threaded mounting and an 18-inch wiring harness, this sensor installs directly into the exhaust system without modification, providing a precise fit for Hyundai and Kia models including the Sonata, Santa Fe, Optima, Sportage, Magentis, Tiburon, and Tucson.

The Direct Fit Oxygen Sensor product line from NTK focuses on delivering sensors that match OEM specifications for fit, form, and function. This ensures compatibility and reliable performance in emission control systems, helping maintain your vehicle’s fuel efficiency and emissions compliance.

Common Applications and Issues Addressed

• Restores accurate air-fuel mixture readings for engine control
• Resolves check engine light triggers related to oxygen sensor faults
• Improves fuel economy by providing precise exhaust gas data
• Reduces harmful emissions by ensuring proper catalytic converter operation
• Eliminates rough idling or poor engine performance caused by faulty sensors

Installation Notes and Tips

• Ensure the engine and exhaust system are cool before installation
• Use appropriate tools to avoid damaging the 18mm threaded sensor
• Verify wiring connections match the four-wire configuration for proper function
• Follow vehicle-specific service manual instructions for sensor replacement
• Check for exhaust leaks after installation to maintain sensor accuracy

Quality Assurance and Warranty

NTK oxygen sensors are manufactured to meet strict quality standards and OEM specifications. The Direct Fit Oxygen Sensor 25181 undergoes rigorous testing to ensure durability and reliable performance in emission control systems. While specific warranty details may vary, NTK typically offers coverage against defects in materials and workmanship to provide confidence in your purchase.