Bosch 13111 Oxygen Sensor - Downstream

Bosch Engineered Oxygen Sensor for Downstream Control

Bosch 13111 is a specific-fit, narrow-band heated oxygen sensor built for downstream air-fuel monitoring and stable closed-loop operation. It uses a threaded metal housing, a square connector, and a 4-wire harness to deliver direct replacement fitment for select Chevrolet, Pontiac, Oldsmobile, and Saturn applications.

The Bosch Engineered Oxygen Sensor line builds on Bosch OE development in oxygen sensing, including faster sensor response, accurate lambda measurement, and durable construction for high-heat environments. Bosch 13111 is a practical replacement choice for drivers servicing a downstream O2 sensor on vehicles such as the Chevrolet Malibu, Chevrolet Corvette, Pontiac Grand Am, and Oldsmobile Alero.

Key Features

• Bosch part number 13111
• Specific-fit downstream oxygen sensor
• Narrow-band heated sensor design
• 4-wire harness with square connector
• Threaded mounting with 18 mm thread size
• 22 mm hex size for service access
• Metal housing for high-temperature operation
• Wiring harness included
• Standard replacement grade

How Bosch Engineered Oxygen Sensors Perform

This Bosch Engineered Oxygen Sensor uses advanced ceramic sensing elements and heater control to provide precise air-fuel-ratio feedback to the ECU. That helps the engine maintain stable combustion control during warm-up and normal driving, while supporting emissions management across changing load and temperature conditions. Bosch 13111 is engineered for downstream use and direct replacement service on select GM and Saturn platforms.

This part cross-references GM OE numbers 19178745 and 19355309 for the same application.

Vehicle Fitment

• Fits 1999-2004 Oldsmobile Alero, Downstream
• Fits 1999-2004 Pontiac Grand Am, Downstream
• Fits 1997-2003 Chevrolet Corvette, Downstream
• Fits 1997-2003 Chevrolet Malibu, Downstream
• Fits 2001 Saturn L100, Downstream
• Fits 2001 Saturn L200, Downstream
• Fits 2001 Saturn LW200, Downstream
• Fits 2000 Saturn LS, Downstream
• Fits 2000 Saturn LS1, Downstream
• Fits 2000 Saturn LW1, Downstream
• Fits 1999 Chevrolet Malibu, Downstream, RPO Code RC9
• Fits 1997-1999 Oldsmobile Cutlass, Downstream
• Fits 1999 Pontiac Grand Am, Downstream, RPO Code RC9

Installation Notes

Confirm the downstream sensor location before ordering, since Bosch 13111 is not a universal-fit part. Match the connector shape, 4-wire configuration, 18 mm thread size, and harness length to the original sensor on the vehicle. For best results, inspect the exhaust bung threads and connector condition before installation, and route the harness away from heat sources and moving components.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development in emissions sensing. The Bosch Engineered Oxygen Sensor line is built to OE-style standards for accuracy, durability, and consistent operation in demanding thermal and vibration conditions.