Bosch 13574 Oxygen Sensor - Downstream Left, Downstream Right or Upstream Left

Reliable Oxygen Sensor for Mazda 626 and Millenia

The Bosch Validated Oxygen Sensor 13574 is designed specifically for Mazda 626 and Millenia models, providing accurate emissions control and engine performance monitoring. This narrow-band heated oxygen sensor ensures precise air-fuel mixture readings to help maintain optimal engine efficiency.

• Specific fit for Mazda 626 and Millenia vehicles
• Narrow-band heated oxygen sensor type for accurate emissions data
• Threaded mounting type with 18 mm thread diameter and 22 mm hex size
• Includes a 21.4-inch wiring harness with 4-pin rectangular female connector
• Durable metal housing finished in steel for long-lasting performance
• Standard replacement grade with 4-wire configuration and heated sensor element

About the Bosch Validated Oxygen Sensor Line

The Bosch Validated Oxygen Sensor product line focuses on delivering reliable and precise sensor solutions that meet OEM specifications. This line is engineered to provide consistent performance in emission control systems, ensuring compatibility and durability. The 13574 sensor is part of this line, offering a specific fit and heated narrow-band sensing technology tailored for Mazda vehicles.

Detailed Product Description

The Bosch 13574 oxygen sensor features a narrow-band heated design, which allows it to quickly reach operating temperature and provide accurate oxygen level readings in the exhaust stream. Its 4-wire configuration includes a heated element to improve sensor response time and durability. The sensor mounts via a threaded 18 mm diameter fitting and uses a 22 mm hex size for installation. The wiring harness length is 21.4 inches, terminating in a 4-pin rectangular female connector, ensuring a secure and precise connection. The sensor housing is constructed from metal with a steel finish, providing resistance to harsh under-hood conditions.

Common Applications and Issues Addressed

• Helps maintain proper air-fuel ratio for Mazda 626 and Millenia engines
• Reduces emissions by providing accurate oxygen level feedback to the engine control unit
• Prevents engine performance issues related to faulty oxygen sensors
• Addresses check engine light triggers caused by sensor failure
• Improves fuel efficiency by ensuring correct combustion monitoring

Installation Notes and Tips

• Ensure vehicle compatibility with Mazda 626 or Millenia models before installation
• Use a 22 mm oxygen sensor socket for proper removal and installation
• Do not overtighten; torque to manufacturer specifications for the 18 mm threaded fitting
• Inspect wiring harness and connector for damage before installation
• Verify sensor connector is securely attached to avoid signal interruptions

Quality Assurance and Warranty

The Bosch Validated Oxygen Sensor 13574 is manufactured to meet strict quality standards, ensuring reliable performance and durability. Bosch provides a standard warranty on this sensor, covering defects in materials and workmanship. This oxygen sensor is engineered to meet or exceed OEM specifications for Mazda 626 and Millenia vehicles, supporting long-term emission control system functionality.