Bosch 13191 Oxygen Sensor - Downstream or Upstream

Bosch Oxygen Sensor for OE-Style Emissions Control

Bosch 13191 is a narrow-band, non-heated oxygen sensor built for specific vehicle applications that require accurate air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management across normal driving conditions, with fitment for select Chevrolet S10, GMC Sonoma, and other listed models.

Key Features

• Bosch Engineered Oxygen Sensor line with OE development heritage
• Narrow-band, non-heated sensor design for specific applications
• Threaded mounting with 18 mm thread size and 22 mm hex size
• Blade terminal type with oblong male connector
• Wiring harness included for direct replacement use
• Steel finish with metal housing for underhood and exhaust-area durability
• Specific fit application for listed upstream and downstream positions

Product Details

Bosch 13191 uses a switching-type oxygen sensing element to report exhaust oxygen content to the engine control unit, helping the system maintain the correct fuel mixture. Bosch’s oxygen sensor development began with early OE thimble designs and later advanced to planar narrowband technology, improving response time and closed-loop operation in many applications. This part cross-references GM OE numbers 12563848 and 24577552 for the same application.

Compatible With select 2000-2003 Chevrolet S10 upstream applications, 2000-2003 GMC Sonoma upstream applications, 2002 Chevrolet Cavalier downstream applications, and additional listed Saturn, Pontiac, Oldsmobile, and Chevrolet models. Bosch 13191 is a practical replacement choice when you need a direct-fit narrow-band oxygen sensor for emissions feedback and drivability restoration.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect fuel trim readings from a worn sensor
• Rough idle or inconsistent combustion control caused by poor exhaust feedback
• Failed emissions inspection tied to sensor output issues
• Delayed or unstable closed-loop operation on affected vehicles

Installation Notes and Tips

Verify the sensor position before ordering, since this part is listed for both upstream and downstream locations depending on vehicle application. Confirm the 18 mm thread size, blade terminals, and oblong connector match the original unit before installation. For best results, inspect the harness routing and connector condition during replacement, especially on higher-mileage Chevrolet S10 and GMC Sonoma applications.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development experience. The Bosch Engineered Oxygen Sensor line is built around durable materials, controlled heater and sensing-element design principles, and OE-proven engineering used by vehicle manufacturers.