Bosch 13055 Oxygen Sensor - Downstream

Bosch Oxygen Sensor for Saturn Downstream Applications

Bosch Engineered Oxygen Sensor Part Number 13055 is a specific-fit, narrow-band heated oxygen sensor for downstream use on select Saturn models. It provides the ECU with air-fuel-ratio feedback needed for stable combustion control and emissions management across changing operating conditions.

Built with Bosch’s OE-focused oxygen sensor engineering, this sensor uses a threaded metal housing, square connector, and included wiring harness for a direct replacement style installation. It is a practical choice for Saturn SC1, SC2, SL, SL1, SL2, SW1, and SW2 downstream service where accurate sensor response matters.

Key Features

• Bosch Engineered Oxygen Sensor, Part Number 13055
• Narrow-band heated oxygen sensor design
• Specific fit for downstream applications
• 4-wire configuration with blade terminals
• Square male connector and included wiring harness
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing for durability in high-heat exhaust locations

Product Details

Bosch developed its oxygen sensor technology from early OE designs and later planar narrowband formats that improve light-off speed, lambda accuracy, and closed-loop response. This Bosch Engineered Oxygen Sensor Part Number 13055 follows that OE development approach with a heated narrow-band sensor element and temperature-resistant materials for consistent signal output under thermal and vibration load. It is a direct replacement for downstream service on 1996-1999 Saturn SC1, SC2, SL, SL1, SL2, SW1, and SW2. This part cross-references 25312198 for the same application.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Unstable air-fuel ratio feedback to the ECU
• Delayed closed-loop operation after startup
• Reduced emissions control efficiency
• Faulty downstream sensor readings on Saturn exhaust systems

Installation Notes and Tips

Verify downstream placement before installation and confirm the 18 mm threaded bung matches the exhaust location. Inspect the connector, harness routing, and nearby exhaust components for heat damage before connecting the new sensor. Use proper oxygen sensor service tools to avoid damaging the hex or wiring during removal and installation.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development experience and a long history of supplying oxygen sensors to vehicle manufacturers and the aftermarket. The design emphasizes accurate signal control, heater performance, and durability for standard replacement service.