Bosch Rear Downstream Oxygen Sensor for Porsche 986 Boxster (2003-2004)

This Bosch Rear Downstream oxygen sensor is a direct-fit replacement for Porsche 986 Boxster applications listed in the fitment table below. Bosch has been a global leader in automotive technology since 1886, pioneering innovations like electronic fuel injection and oxygen (lambda) sensors that shaped modern engine management. Today, Bosch supplies OEM-quality sensors, engine electronics, ignition components, and braking parts found in vehicles worldwide. Known for precision engineering and reliable performance, Bosch parts are built to factory specifications for dependable fitment and long-term durability. The downstream sensor tracks catalyst output and gives the DME the feedback it needs to monitor system efficiency and emissions faults.

Technical Details

• Manufacturer part number: 16506
• Position: Rear / downstream
• Direct-fit heated oxygen sensor with OE connector
• OE reference commonly listed as: 986 606 226 00
• Thread-in exhaust sensor for post-catalyst monitoring
• Verify sensor location before ordering on cars with more than one O2 sensor per bank

Fitment & Compatibility

Use the fitment table below to confirm year and model coverage for your Boxster. Oxygen sensor location matters, so verify that you need the rear downstream sensor and not the pre-catalyst sensor.

If you want us to confirm the correct sensor before you order, send us your VIN or the fault-code details. We have been helping Porsche owners sort sensor and fitment issues for more than 20 years.