Bosch 13557 Oxygen Sensor - Upstream

Reliable Oxygen Sensor for Subaru Legacy and Outback

The Bosch Validated Oxygen Sensor 13557 is designed specifically for Subaru Legacy and Outback models. This heated, wide-band oxygen sensor ensures accurate air-fuel mixture readings to support optimal engine performance and emissions control.

• Heated oxygen sensor for faster response times
• Specific fit for Subaru Legacy and Outback vehicles
• Wide-band sensor type for precise air-fuel ratio monitoring
• 12.7-inch wiring harness length with connector included
• Threaded mounting type with 18 mm thread diameter
• 4-wire configuration with blade terminal type and male connectors
• Durable metal housing with steel finish
• Compatible with Bosch Validated Oxygen Sensor product line

About the Bosch Validated Oxygen Sensor Line

The Bosch Validated Oxygen Sensor line offers standard replacement sensors that meet OEM specifications for fit and function. This product line focuses on delivering reliable emissions control components that integrate seamlessly with vehicle systems. The 13557 sensor is part of this line, providing a direct-fit solution for Subaru Legacy and Outback models requiring a heated, wide-band oxygen sensor.

Product Details and Specifications

This oxygen sensor features a 4-wire design with a 12.7-inch wiring harness and a square-shaped male connector, ensuring secure electrical connections. The sensor is threaded with an 18 mm diameter and a 22 mm hex size for installation using standard tools. Its metal housing and steel finish provide durability under high-temperature exhaust conditions. The overall length from sealing surface to connector end is approximately 16.1 inches, allowing proper fitment in the exhaust system. The sensor does not include a mounting bracket but is designed for threaded mounting.

Common Applications and Issues Addressed

• Restores accurate oxygen sensing for improved fuel efficiency
• Helps resolve check engine light codes related to oxygen sensors
• Supports proper emissions control to meet regulatory standards
• Reduces rough idling and engine performance issues caused by faulty sensors
• Prevents increased exhaust emissions due to sensor failure

Installation Notes and Tips

Ensure the vehicle is cool before installation to avoid burns. Use a 22 mm oxygen sensor socket for removal and installation. Verify the sensor’s wiring harness length and connector type match the vehicle’s factory setup. Avoid damaging the sensor’s wiring during installation. Thread the sensor carefully to prevent cross-threading. No mounting bracket is included, so use the existing exhaust system mounting points.

Quality Assurance and Warranty

The Bosch Validated Oxygen Sensor 13557 is manufactured to meet OEM standards for fit, form, and function. Bosch provides quality assurance through rigorous testing to ensure reliable operation in Subaru Legacy and Outback vehicles. Warranty coverage details should be confirmed with the original Bosch documentation or authorized distributors.