Bosch 17331 Oxygen Sensor - Upstream

Bosch Wideband OE Oxygen Sensor

Bosch 17331 is an Actual OE wideband air-fuel oxygen sensor built for precise upstream mixture monitoring. It delivers fast, continuous feedback to the ECU, helping maintain accurate fuel control on select Porsche applications, including Porsche 911, Boxster, and Cayman.

The Bosch Actual OE Oxygen Sensor line is based on OE development experience and uses a planar pump-cell design that has become a standard in modern engine management. Bosch 17331 is a specific-fit, heated wideband sensor with a 5-wire harness, blade terminals, and a threaded 18 mm mounting design for direct replacement service.

Key Features

• Wideband A/F oxygen sensor for continuous air-fuel ratio measurement
• Heated design for faster sensor response and stable operation
• Specific-fit replacement for select Porsche upstream applications
• 5-wire configuration with included wiring harness
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing and robust ceramic sensor construction
• Connector shape: oblong, male connector and male terminals

Detailed Description

Bosch 17331 is engineered for upstream exhaust placement where accurate air-fuel data is critical. As a wide band sensor, it measures across the full lambda range rather than only switching between rich and lean, giving the engine control system more detailed input for fuel delivery and emissions management. This makes it a strong OE-style replacement for drivers servicing Porsche 911, Boxster, or Cayman models that require an Actual OE Oxygen Sensor.

This part cross-references 9F1906262 for the same application. Bosch 17331 is a direct-fit service part for 2012-2019 Porsche 911, Upstream; 2016 Porsche Boxster, Upstream; and 2016 Porsche Cayman, Upstream.

What It Helps Address

• Check engine light related to upstream oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn wideband sensor
• Poor fuel control during load changes or temperature swings
• Reduced engine efficiency caused by slow or inaccurate sensor feedback
• Emissions faults tied to degraded oxygen sensor response

Installation Notes and Tips

Verify the connector style, wire count, and upstream location before installation. This sensor uses a threaded 18 mm mount and a 28.5-inch wiring harness, with an overall length of 31.9 inches. Inspect the exhaust bung and wiring routing carefully to avoid strain, heat damage, or connector mismatch during replacement.

For fitment, Bosch 17331 is listed for 2012-2019 Porsche 911, Upstream; 2016 Porsche Boxster, Upstream; and 2016 Porsche Cayman, Upstream. Confirm the vehicle’s original sensor configuration before ordering.

Quality Assurance

Bosch has more than five decades of OE sensor development experience and supplies oxygen sensors to the aftermarket using OE-proven engineering. The Actual OE Oxygen Sensor line is built to meet the demands of modern engine management with fast light-off, controlled heater performance, and durable construction.