Bosch 16197 Oxygen Sensor - Downstream

Bosch OE Oxygen Sensor for Volvo Downstream Applications

Bosch 16197 is a narrow-band heated oxygen sensor built for specific-fit downstream applications on select Volvo models. It provides air-fuel-ratio feedback to the ECU for stable closed-loop control, accurate lambda monitoring, and emissions management.

Compatible with 1999-2004 Volvo C70, downstream; 1999-2000 Volvo S70, downstream; and 1999-2000 Volvo V70, downstream. This Bosch Actual OE Oxygen Sensor line reflects Bosch’s long OE development history and uses a threaded metal housing, 4-wire blade connector, and integrated wiring harness for direct replacement service.

Key Features

• Specific-fit Bosch oxygen sensor for downstream placement
• Narrow-band heated design for faster closed-loop operation
• 4-wire configuration with rectangular male connector
• Threaded mounting with 18 mm thread size and 22 mm hex
• Steel-finish metal housing for high-temperature service
• Wiring harness included with 22.8 in harness length
• Cross-reference part numbers: 9497345, 30637016

Product Details

Bosch 16197 is an Actual OE Oxygen Sensor engineered for precise exhaust feedback in downstream positions. The switching-type narrow-band sensor measures oxygen content in the exhaust stream so the engine control unit can maintain the correct air-fuel ratio during normal driving conditions. Bosch’s planar narrowband sensor development improved response time, light-off behavior, and lambda accuracy, while the ceramic sensing element and heater control help maintain consistent operation under thermal and vibration load. This part is a direct replacement for Volvo C70, Volvo S70, and Volvo V70 applications listed above.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings at the ECU
• Slow downstream sensor response during closed-loop operation
• Emissions test failures tied to sensor degradation
• Rough combustion control caused by inaccurate lambda feedback

Installation Notes

• Verify downstream location and connector style before installation.
• Use the 18 mm thread size and 22 mm hex specification to confirm tool fitment.
• Inspect the exhaust bung threads and wiring routing before tightening the sensor.
• Clear diagnostic trouble codes after installation and confirm normal sensor operation.

Quality Assurance

Bosch supplies this oxygen sensor as part of its Actual OE line, drawing on more than five decades of OE sensor development and aftermarket support. The design uses OE-proven materials and heater control strategies for consistent performance in demanding exhaust environments.