Bosch 18080 Oxygen Sensor - Upstream

Bosch Wideband O2 Sensor for Subaru

Bosch Validated Oxygen Sensor 18080 is a specific-fit wideband air-fuel ratio sensor for Subaru applications that require precise upstream mixture feedback. It uses a heated, 4-wire design with a square male connector and included wiring harness to deliver accurate signal response for engine management on the 2009-2014 Subaru Impreza, 2013-2014 Subaru WRX, and 2010-2013 Subaru Forester.

Key Features

• Wideband A/F oxygen sensor for continuous air-fuel ratio measurement across the lambda range
• Heated sensor with optimized heater control for faster light-off and stable operation
• Specific-fit design with 9 in wiring harness length and 11.2 in overall length
• 4-wire, blade-terminal construction with square male connector and male terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Steel finish and metal housing for standard replacement use
• Fits upstream locations on select Subaru Impreza, WRX, and Forester models

Product Details

Bosch 18080 is part of the Bosch Validated Oxygen Sensor line, a product family focused on OE-style replacement coverage and validated fitment. Bosch pioneered the wideband A/F oxygen sensor design used in modern engine management, and this sensor follows that approach with fast response, robust ceramic construction, and precise feedback for the ECU. For drivers searching for a Subaru Impreza upstream oxygen sensor, Subaru WRX wideband O2 sensor, or Subaru Forester air-fuel ratio sensor replacement, this part provides the correct configuration for the listed applications.

This part cross-references Subaru OE numbers 22641AA420 and 22641AA590 for the same application.

What It Helps Address

• Check engine light related to upstream oxygen sensor performance
• Incorrect air-fuel ratio readings sent to the ECU
• Rough idle or inconsistent fuel control caused by sensor degradation
• Reduced fuel efficiency from inaccurate mixture feedback
• Emissions test failures tied to faulty wideband sensor operation

Installation Notes and Tips

Install Bosch 18080 in the upstream position only for the listed Subaru fitments. Verify connector shape, wire count, thread size, and harness length before installation, and inspect the exhaust bung threads for damage or contamination. Use proper oxygen sensor service tools and follow the vehicle service procedure for routing the harness away from heat and moving components.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development and aftermarket sensor engineering. The Bosch Validated Oxygen Sensor line is built to OE-proven standards for accurate signal control, thermal durability, and dependable operation in demanding engine conditions.