Bosch 13109 Oxygen Sensor - Upstream

Bosch Actual OE Oxygen Sensor for BMW 525i

Bosch 13109 is an Actual OE Oxygen Sensor for select BMW 525i applications. It is listed for upstream placement on 1989-1991 BMW 525i models, making it a direct-fit option for oxygen sensor replacement on the specified vehicles.

Key Features

• Brand: Bosch
• Product line: Actual OE Oxygen Sensor
• Part number: 13109
• Upstream oxygen sensor location
• Fits 1989-1991 BMW 525i
• Emission control sensor for air-fuel monitoring

Product Details

The Bosch Actual OE Oxygen Sensor line is built for applications that require an OE-style replacement sensor with the correct fitment and function for the vehicle platform. For BMW 525i models from 1989 through 1991, Bosch 13109 serves as an upstream sensor used by the engine management system to monitor exhaust oxygen content and support fuel control. If you are searching for a Bosch 13109 oxygen sensor for BMW 525i upstream replacement, this part matches the listed application.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Issues Addressed

• Check engine light related to oxygen sensor performance
• Rough idle caused by inaccurate exhaust oxygen readings
• Reduced fuel economy from incorrect air-fuel feedback
• Failed emissions inspection tied to sensor output faults
• Driveability problems from delayed upstream sensor response

Installation Notes and Tips

Install Bosch 13109 in the upstream position specified for 1989-1991 BMW 525i applications. Confirm the connector style, sensor routing, and exhaust location against the original part before installation. After replacement, clear diagnostic trouble codes and verify proper sensor operation with a scan tool.

Quality Assurance

Bosch Actual OE Oxygen Sensor parts are produced for OE-style fitment and application-specific replacement on the listed BMW 525i vehicles. Bosch 13109 is cataloged for 1989, 1990, and 1991 BMW 525i upstream use.