Bosch 17004 Oxygen Sensor - Downstream, Upstream, Upstream Left or Upstream Right

Bosch Wideband OE Oxygen Sensor

Bosch 17004 is a heated wideband air-fuel oxygen sensor built for precise mixture feedback in modern engine management systems. It delivers continuous lambda measurement across the full range, helping the ECU maintain accurate control during changing load and temperature conditions.

• Wideband A/F oxygen sensor for detailed air-fuel ratio measurement
• Heated design for faster light-off and stable operation
• Specific-fit replacement with 5-wire harness and included wiring harness
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Oblong male connector with blade terminals
• Metal housing for OE-style durability
• Overall length: 14.2 in; sealing surface to connector end: 13 in

OE-Style Performance and Fitment

As part of Bosch Actual OE Oxygen Sensor line, this sensor reflects Bosch’s long OE development history and the planar pump-cell wideband design used in modern emissions and fuel-control systems. Bosch 17004 is a direct replacement for vehicles that require a wideband upstream or downstream sensor, including Mercedes-Benz ML350, S550, S400, and Jeep Grand Cherokee applications listed below. This part cross-references 5149012AA and 0035426918 for the same application.

• Fits 2012-2015 Mercedes-Benz ML350, Upstream
• Fits 2010 Mercedes-Benz ML350, Upstream
• Fits 2013 Mercedes-Benz G63 AMG, Upstream
• Fits 2012-2013 Mercedes-Benz S350, Upstream
• Fits 2010-2013 Mercedes-Benz S400, Upstream Left
• Fits 2012 Mercedes-Benz R350, Upstream
• Fits 2007-2011 Mercedes-Benz S550, Upstream Right
• Fits 2009-2010 Mercedes-Benz CL550, Upstream Right
• Fits 2007-2009 Jeep Grand Cherokee, Upstream
• Fits 2007-2009 Mercedes-Benz E320, Downstream
• Fits 2007-2009 Mercedes-Benz R320, Upstream
• Fits 2008-2009 Mercedes-Benz S450, Upstream Right

What This Oxygen Sensor Helps Address

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

Installation Notes and Tips

Verify the connector shape, wire count, thread size, and sensor position before installation. This is a specific-fit sensor, so match the vehicle application and location exactly, especially for upstream left, upstream right, or downstream placements on Mercedes-Benz models. Inspect the harness routing and connector condition during replacement to avoid strain on the new sensor lead.

Quality Assurance

Bosch supplies this sensor as an OE-style replacement backed by more than five decades of original equipment development. The wideband design, heater control, and ceramic construction are engineered for consistent signal accuracy and reliable operation in demanding thermal conditions.