Bosch 17407 Oxygen Sensor - Upstream

Bosch Wideband O2 Sensor for OE Fitment

Bosch Part Number 17407 is an Actual OE Oxygen Sensor built as a wideband air-fuel sensor for precise mixture monitoring. It is a specific-fit, heated replacement with a 5-wire design, threaded mounting, and a wiring harness included for direct service on select Audi applications.

Key Features

• Wideband A/F oxygen sensor for continuous air-fuel ratio measurement across the full lambda range
• Heated sensor design for faster light-off and stable operation during cold starts
• Specific-fit replacement with oblong connector, male connector gender, and female terminals
• 5-wire configuration with 22.4 in wiring harness length and 24.6 in sealing surface to connector length
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Robust metal housing and ceramic sensor construction for thermal durability

Product Details

Bosch 17407 is part of the Bosch Actual OE Oxygen Sensor line, which focuses on OE-style replacement sensors built to match factory requirements for modern engine management systems. Bosch pioneered the wideband planar pump-cell design used in current low-emission applications, and this sensor follows that approach with fast response, optimized heater control, and accurate feedback to the ECU. For drivers searching for an Audi A8 Quattro upstream oxygen sensor, Audi RS7 upstream oxygen sensor, or Bosch 17407 replacement for Audi S6, S7, or S8, this part is built for the cylinder bank 1 to 4 upstream position on the listed vehicles.

This part cross-references 4H0906262P for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings at the ECU
• Poor fuel economy caused by inaccurate mixture control
• Rough running or hesitation during load changes
• Emissions test failures tied to upstream sensor faults

Installation Notes

Confirm the upstream location and cylinder bank application before installation. The sensor uses a threaded mount with an 18 mm thread size, so the correct oxygen sensor socket or wrench is recommended. Verify connector shape, terminal count, and harness routing against the original part to ensure proper fit on the Audi A8 Quattro, RS7, S6, S7, or S8. Because this is a specific-fit sensor, matching the OE connector and harness layout is important for a clean installation.

Quality Assurance

Bosch backs this sensor with more than five decades of OE development in oxygen sensing and engine management technology. The Actual OE Oxygen Sensor line is built to deliver OE-proven accuracy and durability for modern wideband applications.