NTK 25613 Oxygen Sensor - Downstream, Downstream Left or Downstream Right

Overview of NTK Direct Fit Oxygen Sensor 25613

The NTK Direct Fit Oxygen Sensor 25613 is engineered for precise emission control in select BMW and Mercedes-Benz models. This heated oxygen sensor features a specific fit design, ensuring compatibility and reliable performance for vehicles such as the BMW 3 Series and Mercedes-Benz C-Class.

• Heated oxygen sensor for faster response times
• Specific fit for accurate installation on BMW and Mercedes-Benz vehicles
• 19.75-inch wiring harness length for optimal routing
• Threaded mounting type with 18mm thread diameter
• Four-wire configuration for enhanced sensor functionality

Direct Fit Oxygen Sensor Product Line Details

The NTK Direct Fit Oxygen Sensor line is designed to provide exact replacement sensors that match OEM specifications. This product line focuses on delivering sensors with precise wiring harness lengths, thread sizes, and mounting types to ensure seamless integration with the vehicle’s emission system. The 25613 sensor maintains these standards, offering a direct fit solution for improved installation efficiency and sensor performance.

Technical Description and Features

The NTK 25613 oxygen sensor is a heated sensor type, which allows it to reach operating temperature quickly, improving fuel efficiency and reducing emissions. It features a 19.75-inch wiring harness length, providing sufficient cable length for proper installation without excess slack. The sensor uses a threaded mounting type with an 18mm thread diameter, compatible with specific BMW and Mercedes-Benz models. The four-wire design supports both the sensor signal and heater circuit, ensuring accurate oxygen level readings and reliable heater operation.

Compatible Vehicles and Applications

• BMW 1 Series M, 128i, 135i
• BMW 3 Series models including 323i, 325i, 328i, 330i, 335i, and their xDrive variants
• BMW 5 Series models such as 525i, 528i, 530i, and their xDrive versions
• Mercedes-Benz C-Class models including C240, C320, C55 AMG
• Mercedes-Benz E-Class models like E320, E500, E55 AMG
• Additional Mercedes-Benz models including CLK, CLS, SL, ML, and AMG variants

Common Issues Addressed by This Oxygen Sensor

• Check engine light triggered by faulty oxygen sensor readings
• Poor fuel economy due to incorrect air-fuel mixture
• Increased vehicle emissions failing regulatory standards
• Engine performance problems such as rough idling or hesitation
• Failed emissions tests related to sensor malfunction

Installation Notes and Tips

Ensure the vehicle is cool before beginning installation to avoid burns. Use appropriate tools to remove the old sensor and install the NTK 25613 sensor, taking care to avoid damaging the wiring harness. Verify the 18mm threaded mounting fits securely and that the four-wire connector is properly attached. It is recommended to apply anti-seize compound on the threads to facilitate future removal. After installation, clear any diagnostic trouble codes and perform a test drive to confirm proper sensor operation.

Quality Assurance and Warranty

NTK oxygen sensors are manufactured to meet strict OEM standards for durability and accuracy. The Direct Fit Oxygen Sensor 25613 undergoes rigorous testing to ensure reliable performance in emission control systems. While specific warranty details may vary, NTK typically offers coverage against defects in materials and workmanship, providing confidence in the sensor’s long-term functionality.