Bosch 17365 Oxygen Sensor - Upstream

Overview

Bosch 17365 is an Actual OE wideband oxygen sensor built for precise air-fuel ratio monitoring in modern BMW engine management systems. It uses a heated, threaded design with a 5-wire harness and square female connector for specific-fit replacement applications.

Fits 2019-2025 BMW Z4, upstream; Fits 2020-2024 BMW 330i, upstream; Fits 2020-2024 BMW X3, upstream.

Key Features

• Wideband A/F sensor measures across the full lambda range for detailed mixture control.
• Heated sensor design supports faster light-off and stable operation during cold starts.
• Robust ceramic construction and metal housing handle thermal cycling and load changes.
• Specific-fit replacement with threaded mounting and a square female connector.
• 36-inch wiring harness and 6-terminal configuration for direct sensor replacement.

Detailed Description

Bosch 17365 is a wideband oxygen sensor engineered to provide continuous, high-precision air-fuel ratio feedback to the ECU. That level of signal detail supports accurate fuel control, improved engine response, and lower emissions under changing operating conditions. As an Actual OE Oxygen Sensor from Bosch, this part reflects the company’s long OE development history and its role in introducing the planar pump-cell wideband design used in modern engine management.

This Bosch oxygen sensor is a strong match for BMW applications that require upstream wideband monitoring, including BMW 230i, BMW 330i, BMW 430i, BMW X3, and BMW Z4 fitments listed for this part number 17365. The threaded mounting style, 18 mm thread size, and 22 mm hex size support service replacement where the original sensor uses the same configuration.

This part cross-references BMW 11788659971 for the same application.

What It Helps Address

• Incorrect air-fuel ratio readings from a worn upstream sensor
• Rough idle or hesitation caused by inaccurate mixture feedback
• Reduced fuel economy from poor fuel control
• Higher emissions from delayed or unstable sensor response
• Check engine light conditions related to oxygen sensor performance

Installation Notes

Confirm upstream placement, connector style, wire count, and thread size before installation. This Bosch 17365 uses a threaded mount, female connector, and included wiring harness; verify the harness length and sensor routing match the original layout on the vehicle.

Quality Assurance

Bosch backs this wideband oxygen sensor with OE development experience and durable construction intended for reliable signal accuracy in demanding thermal conditions.