Bosch 17249 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Bosch Wideband OE Oxygen Sensor

Bosch 17249 is an Actual OE Oxygen Sensor built as a wideband air-fuel ratio sensor for precise engine management. It provides continuous measurement across the full lambda range, helping the ECU maintain accurate mixture control in demanding driving conditions.

Compatible With Mercedes-Benz G550, G63 AMG, G63 4x4 Squared AMG, C63 AMG, C63 AMG S, GLC63 AMG, and GLC63 AMG S applications that use an upstream wideband sensor. Bosch 17249 is a direct-fit, heated replacement with the connector, harness, and threaded mounting style needed for the listed applications.

Key Features

• Wideband A/F oxygen sensor for precise air-fuel ratio feedback
• Heated design for faster sensor operation after startup
• Specific-fit replacement with 5-wire harness and included wiring harness
• Blade terminals, oblong male connector, and threaded mounting
• 18 mm thread diameter with 22 mm hex size
• Metal housing with robust ceramic sensor construction
• Overall length: 41.5 in; sealing surface to connector end: 40.4 in

Product Details

Bosch’s Actual OE Oxygen Sensor line is based on original-equipment engineering and wideband sensor technology used in modern engine management systems. Part number 17249 uses a planar pump-cell design to deliver detailed air-fuel ratio data rather than the on/off style signal of a traditional switching sensor. That makes Bosch 17249 a strong OE-style replacement for Mercedes-Benz performance and luxury models that rely on accurate upstream feedback for fuel control and emissions monitoring.

This part cross-references Bosch 0005423400 for the same application.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor or air-fuel ratio faults
• Rough idle caused by inaccurate upstream mixture readings
• Poor fuel economy from incorrect fuel trim correction
• Delayed sensor response during cold start or rapid load changes
• Emissions test failures tied to faulty wideband sensor output

Installation Notes

Fits 2019-2024 Mercedes-Benz G550, Upstream Right. Fits 2023-2024 Mercedes-Benz G63 4x4 Squared AMG, Upstream Right. Fits 2019-2024 Mercedes-Benz G63 AMG, Upstream Right. Fits 2023 Mercedes-Benz C63 AMG S, Upstream. Fits 2015-2021 Mercedes-Benz C63 AMG S, Upstream. Fits 2016-2021 Mercedes-Benz C63 AMG, Upstream. Fits 2018-2021 Mercedes-Benz GLC63 AMG, Upstream Left. Fits 2018-2021 Mercedes-Benz GLC63 AMG S, Upstream Left.

Verify connector shape, wire count, and sensor position before installation. Use the threaded mounting point and correct 18 mm oxygen sensor socket for removal and installation. Confirm the upstream location on the vehicle before replacing the sensor.

Quality Assurance

Bosch has more than five decades of OE development in oxygen sensor technology. Part number 17249 is built to Bosch OE standards for accurate signal output, fast light-off, and reliable operation under thermal cycling and load changes.