Bosch 15257 Oxygen Sensor - Downstream Front

Reliable Oxygen Sensor for Mazda MPV Emission Control

The Bosch Validated Oxygen Sensor 15257 is designed specifically for the Mazda MPV, ensuring precise air-fuel mixture readings to optimize engine performance and reduce emissions. This narrow-band heated oxygen sensor offers a direct replacement solution with exact fitment and reliable operation.

• Compatible with Mazda MPV models requiring part number 15257
• Heated narrow-band oxygen sensor for accurate emissions monitoring
• Threaded mounting type with 18 mm thread diameter and 22 mm hex size
• Includes a 17.7-inch wiring harness with 4 male blade terminals and a square male connector
• Constructed with durable metal housing and steel finish for longevity
• Overall length of 21.5 inches with 20.3 inches from sealing surface to connector end
• Standard replacement grade for dependable performance

About the Bosch Validated Oxygen Sensor Line

The Bosch Validated Oxygen Sensor line is engineered to meet strict OEM specifications, providing a reliable and precise fit for specific vehicle applications. This product line focuses on delivering sensors that maintain emission control system integrity while ensuring compatibility with factory wiring and connectors. The 15257 sensor is part of this line, offering a direct fit and function for the Mazda MPV.

Product Details and Specifications

This Bosch oxygen sensor features a narrow-band heated design, which allows it to quickly reach operating temperature and provide accurate oxygen level readings to the engine control unit. The sensor’s metal housing and steel finish enhance durability under high-temperature exhaust conditions. The 4-wire configuration with blade terminals and a square male connector ensures secure electrical connections. Its threaded mounting type with an 18 mm diameter and 22 mm hex size allows for straightforward installation using standard tools.

Common Applications and Problem Solving

• Restores proper air-fuel ratio sensing for Mazda MPV emission systems
• Resolves check engine light issues related to oxygen sensor faults
• Improves fuel efficiency by providing accurate oxygen level data
• Helps reduce harmful exhaust emissions to meet regulatory standards
• Eliminates rough idling or engine hesitation caused by faulty sensors

Installation Notes and Tips

• Ensure vehicle compatibility with Mazda MPV models requiring part number 15257 before installation
• Use a 22 mm oxygen sensor socket or wrench for removal and installation
• Do not overtighten the sensor; torque to manufacturer specifications
• Inspect wiring harness and connector for damage before connecting
• Allow the engine to cool before replacing the sensor to avoid burns

Quality Assurance and Warranty

The Bosch Validated Oxygen Sensor 15257 is manufactured to meet OEM standards for fit, form, and function. Bosch provides quality assurance through rigorous testing to ensure sensor reliability and durability. This part is a standard replacement grade component designed to maintain the emission control system’s performance. Warranty details should be confirmed with the parts distributor or Bosch directly.