Bosch 16417 Oxygen Sensor - Downstream

Bosch OE Downstream Oxygen Sensor

Bosch 16417 is an Actual OE Oxygen Sensor built for precise air-fuel-ratio feedback to the ECU. This narrow-band heated sensor is a direct-fit, threaded replacement for downstream applications on select BMW models, including BMW 335i, BMW X5, and BMW 640i.

Key Features

• Actual OE Oxygen Sensor from Bosch Actual OE Oxygen Sensor line
• Narrow-band heated oxygen sensor for closed-loop fuel control
• Specific-fit design with threaded mounting
• 4-wire harness with included wiring harness and rectangular male connector
• 18 mm thread diameter and 22 mm hex size
• Steel finish with metal housing for underbody durability
• Wiring harness length: 24.4 in; overall length: 27.8 in

Product Details

Bosch 16417 uses advanced ceramic sensing elements and optimized heater control to deliver stable signal output across changing exhaust temperatures. Bosch developed this oxygen sensor technology from its original OE sensor designs and later planar narrowband architecture, focusing on faster light-off, accurate lambda measurement, and quicker closed-loop operation. For BMW downstream service, this sensor supports consistent combustion control and emissions monitoring on vehicles such as the 2011-2013 BMW 335i, 2011-2017 BMW X3, and 2012-2017 BMW 640i. This part cross-references URO 11787589475 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
• Slow or unstable closed-loop fuel control
• Emissions test failures tied to sensor response issues
• Rough combustion control caused by degraded sensor output

Installation Notes

Install Bosch 16417 in the threaded downstream location specified for the vehicle application. Verify connector shape, wire count, and harness length before installation, and inspect the exhaust bung threads for damage or contamination. Because this is a heated narrow-band sensor, proper connector engagement and secure routing away from exhaust heat are important for reliable operation.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development in emissions and engine management sensing. The design reflects Bosch OE engineering practices used by vehicle manufacturers and is supplied to the aftermarket as a standard replacement part.