Walker 250-25166 Oxygen Sensor - Center, Downstream or Upstream

Overview of Walker OE Base Sensor 250-25166

The Walker OE Base Sensor 250-25166 is a heated wide-band oxygen sensor designed for specific vehicle applications including Audi, BMW, Hyundai, Kia, and Volkswagen models. Engineered to provide accurate air-fuel mixture readings, this sensor supports optimal engine performance and emission control.

• Heated wide-band oxygen sensor for precise air-fuel ratio monitoring
• Specific fit for select Audi, BMW, Hyundai, Kia, and Volkswagen vehicles
• Spade terminal type with 6 male terminals and 5 wires
• Oblong female connector for secure electrical connection
• Thread size M18 - 1.5 with 22mm wrench size for installation

Walker OE Base Sensor Product Line Details

The OE Base Sensor line by Walker focuses on delivering sensors that meet original equipment specifications for emission control systems. The 250-25166 oxygen sensor is part of this line, ensuring compatibility and reliable performance for the specified vehicle models. This product line emphasizes precise sensor technology and fitment accuracy to maintain factory-level emissions compliance.

Technical Description and Features

This oxygen sensor features a heated wide-band design, which allows for faster sensor response and improved fuel management. The sensor’s spade terminal type with six male terminals and a female oblong connector ensures a secure and stable electrical connection. With five wires, it supports complex signal transmission required by modern engine control units. The sensor’s thread size of M18 - 1.5 and 22mm wrench size facilitate straightforward installation in compatible exhaust systems.

Compatible Vehicles and Applications

• Compatible with Audi models such as A3, A3 Quattro, CC, Eos, Q7, TT Quattro, and TTS Quattro
• Fits BMW 335d, 535d, and 535d xDrive models
• Suitable for Hyundai Elantra, Elantra Coupe, Elantra GT, Kia Forte, Forte5, Forte Koup, and Soul
• Designed for Volkswagen Golf R and GTI, as well as X5

Common Issues Addressed by This Oxygen Sensor

• Incorrect air-fuel mixture readings causing poor fuel economy
• Check engine light triggered by faulty oxygen sensor signals
• Increased emissions due to sensor malfunction
• Engine performance issues such as rough idling or hesitation
• Failed emissions tests related to sensor degradation

Installation Notes and Tips

Installation requires a 22mm wrench to remove and replace the sensor. Ensure the sensor thread size M18 - 1.5 matches the vehicle’s exhaust port. The specific fitment means this sensor is designed for direct replacement without modification. Handle the sensor carefully to avoid damage to the heated element and wiring. Verify connector orientation and terminal alignment before securing the connection.

Quality Assurance and Warranty

Walker OE Base Sensors are manufactured to meet or exceed OEM standards for durability and performance. While specific warranty details are not provided here, Walker 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 compatible Audi, BMW, Hyundai, Kia, and Volkswagen vehicles.