Bosch 15099 Oxygen Sensor - Downstream

Bosch 15099 Oxygen Sensor for Volvo

Bosch 15099 is an Actual OE Oxygen Sensor built as a specific-fit, narrow-band heated replacement for downstream applications. It is engineered for 1996-1997 Volvo 960 and 1997-1998 Volvo S90 and V90 models, with the wiring harness included for a direct service replacement.

Key Features

• Specific-fit Bosch oxygen sensor for downstream placement
• Narrow-band heated sensor design for closed-loop fuel control
• 4-wire configuration with rectangular male connector
• Threaded mounting with 18 mm thread size and 22 mm hex
• Wiring harness included for the listed application
• Steel-finish metal housing for underbody exhaust service

OE-Style Sensor Design

As part of Bosch’s Actual OE Oxygen Sensor line, part number 15099 reflects Bosch’s long development history in oxygen sensing technology, including narrowband planar designs that improve light-off response and lambda measurement accuracy. This sensor uses advanced ceramic elements, controlled heater operation, and high-temperature-resistant materials to maintain stable air-fuel ratio feedback under heat and vibration. For Volvo 960, Volvo S90, and Volvo V90 downstream service, Bosch 15099 supports precise ECU input for combustion control and emissions management.

What This Sensor Helps Address

• Check engine light related to downstream oxygen sensor performance
• Erratic air-fuel ratio feedback to the ECU
• Rough idle or drivability issues tied to sensor aging
• Increased emissions from a slow or inaccurate O2 sensor
• Delayed closed-loop operation after startup

Installation Notes

Verify downstream location before installation and match the 4-wire rectangular connector, 18 mm thread size, and 22 mm hex to the original sensor. Inspect the exhaust bung threads and harness routing before tightening the sensor into the threaded mount. This part cross-references 9125582 for the same application.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development and aftermarket supply experience. The Bosch Actual OE Oxygen Sensor line is built to OE-proven standards for accurate signal output and durable operation in demanding exhaust conditions.