Bosch 18174 Oxygen Sensor - Upstream

Reliable Oxygen Sensor for Subaru Forester and WRX

The Bosch Validated Oxygen Sensor 18174 is designed specifically for Subaru Forester and WRX models, ensuring precise emission control and optimal engine performance. This oxygen sensor features a heated wide-band design for accurate air-fuel mixture readings under various driving conditions.

• Specific fit for Subaru Forester and WRX
• Heated wide-band oxygen sensor for improved response
• Threaded mounting type with 18 mm thread diameter
• 9.1-inch wiring harness length with 5 wires and 6 terminals
• Durable metal housing with steel finish and 22 mm hex size
• Includes wiring harness with female square connector
• Standard replacement grade for reliable performance

About the Bosch Validated Oxygen Sensor Line

The Bosch Validated Oxygen Sensor line offers sensors that meet strict quality and performance standards, validated for specific vehicle applications. The 18174 part number belongs to this line, providing a direct fit and reliable operation for Subaru Forester and WRX models. These sensors are engineered to maintain emission compliance and support engine management systems effectively.

Detailed Product Description

This Bosch oxygen sensor 18174 is a narrow-band, wide-band type sensor with a heated element to ensure quick warm-up and accurate oxygen level detection. The sensor features a threaded mounting type with an 18 mm thread diameter and a 22 mm hex size for installation using standard tools. The wiring harness is 9.1 inches long, with 5 wires and 6 female terminals, connected via a square-shaped female connector. The sensor’s metal housing with a steel finish provides durability and resistance to harsh engine environments. Overall length measures 12.6 inches, with 11.4 inches from the sealing surface to the end of the connector, facilitating proper fitment in the exhaust system.

Common Applications and Issues Addressed

• Restores accurate air-fuel ratio readings for Subaru Forester and WRX
• Resolves engine performance issues related to faulty oxygen sensors
• Helps reduce emissions and maintain compliance with environmental standards
• Prevents check engine light triggers caused by sensor failure
• Improves fuel efficiency by providing precise feedback to the engine control unit

Installation Notes and Tips

Ensure the engine and exhaust system are cool before installation to avoid burns. Use a 22 mm oxygen sensor socket or wrench for removal and installation. Verify the wiring harness length and connector type match your vehicle’s specifications. Avoid over-tightening the sensor to prevent thread damage. Since this sensor is a specific fit for Subaru Forester and WRX, confirm compatibility with your vehicle’s year and engine type before installation.

Quality Assurance and Warranty

The Bosch Validated Oxygen Sensor 18174 is manufactured to meet OEM standards for fit, form, and function. Bosch provides consistent quality control to ensure sensor reliability and durability. While specific warranty details are not provided here, Bosch typically offers limited warranties on their oxygen sensors; check with the product documentation or supplier for exact terms.