Bosch 17158 Oxygen Sensor - Upstream Left

Bosch Wideband O2 Sensor for Porsche Cayenne

Bosch 17158 is an actual OE wideband oxygen sensor built for precise air-fuel ratio measurement and stable engine management. It is a direct-fit replacement for the upstream left position on select 2003-2006 Porsche Cayenne models.

Key Features

• Wideband A/F oxygen sensor for continuous lambda-range measurement
• Heated design for faster sensor warm-up and stable operation
• Specific-fit replacement for the upstream left location
• 5-wire design with 6 terminals and included wiring harness
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Robust metal housing and ceramic sensor construction
• Overall length: 59.3 in; harness length: 55.9 in

Product Details

Bosch 17158 uses wideband sensing technology to provide the ECU with detailed air-fuel ratio data across the full operating range, rather than the limited on/off signal of a traditional switching sensor. That level of feedback supports accurate mixture control during idle, acceleration, cruising, and load changes. Bosch pioneered the planar pump-cell wideband design and continues to supply OE-grade oxygen sensors based on decades of engine management development. This part cross-references Bosch 17158 for the same application.

Fits 2003-2006 Porsche Cayenne, upstream left. Fits 2003-2006 Porsche Cayenne, upstream left. For buyers searching for a Porsche Cayenne upstream left oxygen sensor or Bosch 17158 wideband A/F sensor replacement, this part matches the confirmed application listed here.

Common Issues This Sensor Can Address

• Fault codes related to air-fuel ratio sensor performance
• Rough idle or inconsistent fuel control from a worn sensor
• Reduced fuel economy caused by inaccurate mixture feedback
• Emissions test failures tied to sensor response problems
• Delayed sensor reaction during throttle or load changes

Installation Notes and Tips

Verify the upstream left location before ordering and match the connector, thread size, and harness length to the original sensor. Because this is a threaded wideband sensor, use the correct oxygen sensor socket and avoid contaminating the sensing element during installation. Clear diagnostic trouble codes after replacement and confirm live data response with a scan tool.

Quality Assurance

Bosch is a long-standing OE supplier in engine management and oxygen sensing technology. Part number 17158 is built as an OE-style standard replacement with the same application focus and sensor architecture used in modern emissions control systems.