Bosch 15473 Oxygen Sensor - Upstream

Bosch Wideband Oxygen Sensor for Honda and Acura

Bosch Validated Oxygen Sensor 15473 is a specific-fit wideband air-fuel ratio sensor for select 2004-2005 Acura EL and 2004-2005 Honda Civic upstream applications. It provides the ECU with continuous, high-resolution air-fuel data for precise mixture control, stable drivability, and lower emissions.

Built with a heated design, 4-wire configuration, threaded mounting, and a rectangular female connector, this Bosch oxygen sensor is a direct replacement for the original wideband sensor used in these vehicles. The included wiring harness and OE-style construction support accurate signal response in demanding engine conditions.

Key Features

• Wideband A/F oxygen sensor for precise air-fuel ratio measurement
• Specific fit for select Acura EL and Honda Civic upstream locations
• Heated sensor design for faster operating temperature
• 4-wire layout with blade terminals and female rectangular connector
• Threaded 18 mm mounting with 22 mm hex size
• Steel finish with metal housing for standard replacement use
• Wiring harness included

Product Details

Bosch 15473 is part of the Bosch Validated Oxygen Sensor line, a product line 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 reflects that engineering approach with fast light-off, optimized heater control, and robust ceramic construction. For drivers searching for a 2004-2005 Honda Civic upstream oxygen sensor or a 2004-2005 Acura EL wideband O2 sensor, this part provides the correct sensor type and connector style for the listed applications. This part cross-references Honda/Acura OE application 36531PLR003 for the same application.

What It Helps Address

• Check engine light related to upstream oxygen sensor performance
• Incorrect air-fuel ratio readings
• Poor fuel economy caused by inaccurate sensor feedback
• Rough idle or hesitation from improper mixture control
• Elevated emissions from delayed or inaccurate sensor response

Installation Notes and Tips

Verify the upstream sensor location before installation and confirm the connector shape, wire count, and thread size match the original part. Use the 18 mm threaded mounting point and ensure the sealing surface is clean before tightening. Because this is a specific-fit sensor for select Honda Civic and Acura EL applications, compare the original connector and harness routing to the vehicle before installation.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development in engine management and emissions control. The Bosch Validated Oxygen Sensor line is built to OE-proven standards for accurate signal delivery, thermal durability, and reliable operation in standard replacement service.