Bosch 17281 Oxygen Sensor - Upstream

Bosch Wideband OE Oxygen Sensor

Bosch 17281 is an Actual OE wideband oxygen sensor built for precise air-fuel ratio measurement across the full lambda range. It provides the ECU with detailed feedback for accurate mixture control, helping support fuel efficiency, engine response, and lower emissions in the vehicles it serves.

This Bosch Actual OE Oxygen Sensor line uses the same OE-focused engineering trusted by vehicle manufacturers. Bosch 17281 features a heated wide-band design, fast light-off, optimized heater control, and a robust ceramic construction for stable operation during rapid load changes and repeated thermal cycling.

Key Features

• Wide-band oxygen sensor for continuous air-fuel ratio monitoring
• Heated design for quicker sensor activation
• Specific-fit replacement with oblong male connector
• 5-wire harness with included wiring harness
• Threaded mounting type with 18 mm thread diameter
• Metal housing with steel finish
• Overall length: 20.9 in; sealing surface to connector end: 19.8 in
• Hex size: 22 mm

Detailed Description

Bosch 17281 is a standard replacement oxygen sensor engineered for direct-fit service on select BMW and Mercedes-Benz applications. It is listed for 2014-2018 BMW X5 downstream use, plus upstream applications on 2012-2016 Mercedes-Benz E300, 2012-2016 Mercedes-Benz E350, 2012-2015 Mercedes-Benz C350, 2012-2015 Mercedes-Benz E63 AMG, 2013-2015 Mercedes-Benz GLK350, 2013-2014 Mercedes-Benz C300, 2012-2013 Mercedes-Benz CLS550, 2012-2013 Mercedes-Benz CLS63 AMG, 2013 Mercedes-Benz E400, and 2012-2013 Mercedes-Benz E550. If you are searching for a Bosch 17281 oxygen sensor for BMW X5 or Mercedes-Benz E350 upstream service, this part matches the listed OE-style application.

Bosch pioneered the wideband A/F oxygen sensor design, and this part reflects that OE development with a planar pump-cell architecture used for modern engine management. It cross-references Bosch 0085422918 for the same application.

What It Helps Address

• Fault codes related to oxygen sensor performance
• Incorrect air-fuel ratio readings
• Rough idle caused by inaccurate exhaust feedback
• Reduced fuel economy from poor mixture control
• Emissions test failures tied to sensor degradation

Installation Notes and Tips

Confirm the connector shape, wire count, thread size, and sensor position before installation. Bosch 17281 is a specific-fit sensor with a 6-terminal configuration, 17.6 in wiring harness length, and threaded 18 mm mounting. Use the listed vehicle position only: Fits 2014-2018 BMW X5, downstream; Fits 2012-2016 Mercedes-Benz E300, upstream; Fits 2012-2016 Mercedes-Benz E350, upstream; Fits 2012-2015 Mercedes-Benz C350, upstream; Fits 2012-2015 Mercedes-Benz E63 AMG, upstream; Fits 2013-2015 Mercedes-Benz GLK350, upstream; Fits 2013-2014 Mercedes-Benz C300, upstream; Fits 2012-2013 Mercedes-Benz CLS550, upstream; Fits 2012-2013 Mercedes-Benz CLS63 AMG, upstream; Fits 2013 Mercedes-Benz E400, upstream; Fits 2012-2013 Mercedes-Benz E550, upstream.

Quality Assurance

Bosch backs this Actual OE Oxygen Sensor line with more than five decades of OE development and aftermarket supply experience. The sensor is built to OE-proven standards for accuracy, durability, and consistent operation in demanding engine-management systems.