Bosch 17204 Oxygen Sensor - Upstream

Bosch Wideband O2 Sensor for Nissan and Infiniti

Bosch 17204 is an actual OE wideband air-fuel oxygen sensor built for precise upstream mixture monitoring. It provides the ECU with detailed lambda-range feedback for accurate fuel control in vehicles such as the Nissan Armada, Titan, Frontier, Pathfinder, Xterra, Pathfinder Armada, and Infiniti QX56.

Key Features

• Wideband A/F oxygen sensor for continuous air-fuel ratio measurement
• Heated design for faster sensor activity and stable operation
• Specific-fit replacement with 5-wire harness and 6 terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Rectangle male connector with included wiring harness
• Metal housing and ceramic sensor construction for thermal durability
• Overall length: 15.7 in; sealing surface to connector end: 14.6 in

Product Details

Bosch Actual OE Oxygen Sensor 17204 uses Bosch wideband technology to measure the air-fuel mixture across the full operating range, giving the engine control module more precise data than a traditional switching sensor. Bosch pioneered the planar pump-cell wideband design used in modern engine management, and this sensor reflects that OE development with fast light-off, controlled heater performance, and robust construction for demanding exhaust conditions. This part cross-references 226937S000 for the same application.

What It Helps Address

• Rich or lean air-fuel ratio readings from the upstream sensor
• Check engine light concerns related to oxygen sensor performance
• Reduced fuel economy caused by inaccurate mixture feedback
• Rough engine response during load changes or warm-up
• Elevated emissions from poor fuel control

Installation Notes

Fits 2004-2006 INFINITI QX56, upstream. Fits 2005-2006 Nissan Armada, upstream. Fits 2005-2006 Nissan Frontier, upstream. Fits 2005-2006 Nissan Pathfinder, upstream. Fits 2004-2006 Nissan TITAN, upstream. Fits 2005-2006 Nissan Xterra, upstream. Fits 2004 Nissan Pathfinder Armada, upstream. Confirm connector shape, thread size, and upstream location before installation. Use proper oxygen sensor service tools and verify the harness routing matches the original layout.

Quality Assurance

Bosch supplies OE-level oxygen sensor technology backed by more than five decades of engine management development. Part number 17204 is built to the same standards expected for modern wideband sensor applications in Nissan and Infiniti platforms.