Bosch 16198 Oxygen Sensor - Downstream

Bosch OE Oxygen Sensor for Volvo S80

Bosch 16198 is a narrow-band heated oxygen sensor built for precise air-fuel ratio feedback to the ECU. It supports stable combustion control and emissions management for the 1999-2001 Volvo S80 downstream application.

Key Features

• Specific-fit oxygen sensor for the downstream position
• Narrow-band heated design for faster closed-loop operation
• 4-wire harness with rectangular male connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• 62.4 in wiring harness length with included harness
• Metal housing and high-temperature-resistant construction
• Bosch Actual OE Oxygen Sensor line built from OE development experience

Product Details

Built on Bosch’s OE oxygen sensor engineering, part number 16198 uses a switching-type narrow-band design to report exhaust oxygen content to the engine control unit. That signal helps the ECU maintain the correct air-fuel mixture during closed-loop operation, which is important for drivability, fuel control, and emissions performance. This Bosch 16198 oxygen sensor is a direct-fit replacement for the downstream location on 1999-2001 Volvo S80 models.

The Actual OE Oxygen Sensor line reflects Bosch’s long history of original equipment development, including advanced ceramic sensing elements, optimized heater control, and materials selected for heat and vibration resistance. For Volvo S80 owners searching for a downstream oxygen sensor replacement, Bosch 16198 provides the OE-style fit and sensor response expected in standard replacement service.

This part cross-references Volvo 8658090 for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Rough idle or inconsistent closed-loop fuel control
• Emissions test failures tied to sensor response issues
• Slow sensor switching caused by age, heat, or contamination

Installation Notes and Tips

Verify the downstream sensor location before installation on the Volvo S80. Confirm the 4-wire connector, threaded mount, and 18 mm thread size match the original unit. Inspect the harness routing and connector condition before plugging in the replacement, and make sure the exhaust bung threads are clean to avoid cross-threading.

Quality Assurance

Bosch supplies this oxygen sensor as part of its Actual OE Oxygen Sensor line, drawing on more than five decades of OE development and aftermarket support. The design uses OE-proven sensing and heater control principles for consistent signal output under demanding thermal and vibration conditions.