Bosch 16414 Oxygen Sensor - Downstream or Downstream Rear

Bosch OE Oxygen Sensor for BMW

Bosch Actual OE Oxygen Sensor 16414 is a narrow-band heated replacement sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management across changing operating conditions, making it a direct-fit choice for many BMW downstream applications.

Key Features

• Actual OE Oxygen Sensor from Bosch’s OE-focused product line
• Narrow-band heated design for faster closed-loop operation
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Specific-fit sensor with 4-wire harness and round connector
• Wiring harness included with 16.4 in harness length and 18.6 in sealing-surface-to-connector length
• Metal housing and high-temperature-resistant construction for demanding exhaust conditions

Product Details

Bosch 16414 uses a switching-type oxygen sensing element to report exhaust oxygen content to the engine control unit. Bosch developed this OE sensor technology over decades, moving from early thimble-style designs to planar narrowband layouts that improve light-off speed, lambda accuracy, and closed-loop response. For BMW 328i, 335i, X5, and other listed applications, this sensor is specified for downstream and downstream rear positions where accurate exhaust feedback is needed after the catalytic converter.

This part cross-references URO 11787545075 for the same application.

What It Helps Address

• Check engine lights related to oxygen sensor performance
• Unstable air-fuel ratio feedback at the ECU
• Delayed closed-loop operation after startup
• Emissions test failures tied to sensor response issues
• Rough combustion control caused by aging downstream sensor output

Installation Notes and Fitment

Compatible With 2006 BMW 325i, downstream rear; 2006 BMW 325xi, downstream; 2006 BMW 330i, downstream; 2006 BMW 330xi, downstream; 2007-2008 BMW 328xi, downstream and downstream rear; 2007-2008 BMW 335xi, downstream rear; 2007-2010 BMW 328i, downstream and downstream rear; 2007-2010 BMW 335i, downstream; 2007-2010 BMW X3, downstream; 2007-2010 BMW X5, downstream; 2008-2010 BMW 135i, downstream; 2008-2012 BMW 128i, downstream rear; 2008-2013 BMW 128i, downstream; 2009-2011 BMW Z4, downstream; 2009-2013 BMW 328i xDrive, downstream rear; 2009-2016 BMW Z4, downstream rear; 2010-2011 BMW 323i, downstream; 2011 BMW 1 Series M, downstream rear; 2011-2013 BMW 335is, downstream rear; 2013 BMW 328i, downstream rear; 2009-2010 BMW 335i xDrive, downstream rear; 2009-2012 BMW 328i xDrive, downstream rear; 2007-2013 BMW 328i, downstream rear.

Before installation, confirm the connector shape, wire count, and sensor position against the original unit. Use the threaded mounting point and correct 18 mm oxygen sensor socket for removal and installation. This Bosch 16414 is a specific-fit replacement, so matching the listed BMW application and exhaust location is important for proper operation.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development experience. The design uses ceramic sensing elements, controlled heater operation, and durable materials selected for high heat and vibration exposure in modern exhaust systems.