Bosch 15339 Oxygen Sensor - Downstream

Bosch Actual OE Oxygen Sensor 15339

Bosch 15339 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 downstream applications on select BMW M5 and BMW M6 models.

Key Features

• Actual OE Oxygen Sensor from Bosch
• Narrow-band heated O2 sensor for downstream use
• Specific-fit design with 4-wire harness and round male connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing with high-temperature-resistant construction
• Wiring harness included with 10.9 in length
• Part number 15339 for direct catalog lookup

Product Details

Bosch 15339 uses a switching-type sensing element to deliver accurate oxygen content feedback under changing engine loads and temperatures. Bosch developed this sensor line from its OE oxygen sensor engineering, including planar narrowband designs that improve light-off speed, lambda accuracy, and closed-loop response. For BMW M5 and BMW M6 downstream service, this sensor helps maintain proper fuel control and emissions performance while matching OE-style electrical and mechanical specifications. This part cross-references BMW 11787836451 for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Incorrect air-fuel ratio feedback to the ECU
• Rough idle or drivability issues tied to sensor signal degradation
• Emissions test failures caused by inaccurate O2 readings
• Slow closed-loop response after sensor aging or thermal wear

Installation Notes

Compatible with 2006-2010 BMW M5, downstream, and 2006-2010 BMW M6, downstream. Verify connector shape, 4-wire configuration, threaded mounting, and 18 mm thread size before installation. Use the correct oxygen sensor socket for the 22 mm hex and route the harness away from exhaust heat and moving components.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development in emissions control sensing. The design uses ceramic sensing elements, controlled heater operation, and heat-resistant materials to support consistent performance in demanding exhaust conditions.