Bosch 16205 Oxygen Sensor - Downstream

Bosch Actual OE Oxygen Sensor for Porsche

Bosch 16205 is a narrow-band heated oxygen sensor built for precise air-fuel-ratio feedback to the ECU. It is a specific-fit replacement for downstream applications on select Porsche models, including Porsche 911 and Porsche Carrera GT.

Key Features

• Actual OE Oxygen Sensor from Bosch
• Narrow-band heated O2 sensor for closed-loop fuel control
• Specific fit with 4-wire harness and female connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing with high-temperature-resistant construction
• Wiring harness included for direct replacement use
• Part number 16205 for catalog and service reference

Product Details

Bosch 16205 uses advanced ceramic sensing elements and controlled heater operation to deliver stable signal output across changing exhaust temperatures. As part of Bosch’s Actual OE Oxygen Sensor line, it reflects the company’s long OE development history and narrowband sensor design evolution, with a focus on accurate lambda feedback, faster light-off, and consistent closed-loop operation. This sensor is listed for downstream placement on 1998 Porsche 911, 2001-2005 Porsche 911, and 2004-2005 Porsche Carrera GT. If you are searching for a Bosch 16205 oxygen sensor for Porsche 911 downstream or a Bosch 16205 replacement for Porsche Carrera GT downstream, this part matches those confirmed applications.

This part cross-references Porsche 99660613802 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Slow closed-loop response after startup
• Emissions control faults tied to downstream sensor readings
• Rough combustion control caused by a worn narrow-band sensor

Installation Notes

Verify the connector shape, wire count, thread size, and downstream location before installation. This Bosch oxygen sensor uses a threaded mount, 18 mm thread diameter, and a female oblong connector with four terminals. Confirm the vehicle application against the listed fitment for 1998 Porsche 911, 2001-2005 Porsche 911, and 2004-2005 Porsche Carrera GT before replacing the original sensor.

Quality Assurance

Bosch supplies this Actual OE Oxygen Sensor with OE-proven design principles and durable materials intended for demanding exhaust temperatures and vibration exposure. Bosch’s oxygen sensor development spans more than five decades of OE engineering, supporting consistent signal accuracy and dependable emissions control performance.