Bosch 17447 Oxygen Sensor - Upstream, Upstream Front or Upstream Left

Bosch Wideband O2 Sensor for OE-Style Fuel Control

Bosch Part Number 17447 is an Actual OE Oxygen Sensor built for precise air-fuel ratio monitoring in wideband applications. It delivers continuous lambda measurement for accurate ECU feedback, helping maintain stable engine performance and emissions control in the BMW applications listed below.

Key Features

• Wideband A/F oxygen sensor for continuous air-fuel ratio measurement
• Heated design for faster light-off and improved cold-start response
• Specific-fit sensor with 5-wire harness and 6 terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Oblong male connector with included wiring harness
• Metal housing and ceramic sensor construction for durability in thermal cycling
• Overall length: 52.0 in; sealing surface to connector end: 50.8 in

Detailed Description

Bosch 17447 is part of the Bosch Actual OE Oxygen Sensor line, which brings OE-proven sensor technology to the aftermarket. Bosch pioneered the wideband planar pump-cell design used in modern engine management, and this sensor follows that approach with fast response, optimized heater control, and robust construction for accurate readings under changing load conditions. It is a direct-fit replacement for select BMW models, including 2011-2012 BMW 740i, 2011-2012 BMW 740Li, 2008-2010 BMW 535i, 2009-2010 BMW 535i xDrive, 2008-2010 BMW X6, and 2008 BMW 535xi. This part cross-references 11787570760 and 11787586692 for the same application.

What It Helps Address

• Check engine lights related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn wideband sensor
• Rough idle or hesitation caused by inaccurate exhaust feedback
• Reduced fuel economy from poor mixture control
• Elevated emissions from delayed or unstable sensor response

Installation Notes and Tips

Fits 2011-2012 BMW 740i, Upstream Left. Fits 2011-2012 BMW 740Li, Upstream Left. Fits 2009-2010 BMW 535i, Upstream Front, located in exhaust manifold. Fits 2008-2010 BMW 535i, Upstream, cylinder(s) 1, 2, and 3. Fits 2009-2010 BMW 535i xDrive, Upstream, cylinder(s) 1, 2, and 3. Fits 2008-2010 BMW X6, Upstream, cylinder(s) 1, 2, and 3. Fits 2008 BMW 535xi, Upstream, cylinder(s) 1, 2, and 3. Verify connector shape, harness routing, and sensor position before installation. Use the listed BMW application and position to confirm the correct replacement for your vehicle.

Quality Assurance

Bosch supplies OE-level oxygen sensor technology backed by more than five decades of original equipment development. Bosch 17447 is built to the same standards expected in modern BMW engine management systems, with durable materials and precise wideband measurement for consistent service life.