Bosch Upstream Air/Fuel Ratio Sensor for Porsche 987 Boxster/Cayman/997 GT3/GT3 RS (2005-2008)

This Bosch Upstream air/fuel ratio sensor is a direct-fit replacement for Porsche 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. This wideband pre-catalyst sensor measures the mixture directly in the exhaust stream so the DME can make fast and accurate fueling corrections.

Technical Details

• Manufacturer part number: 17276
• Position: Upstream / pre-catalyst
• Bosch wideband air/fuel ratio sensor with OE-style connector
• OE reference commonly listed as: 987 606 123 04
• Used ahead of the catalyst for fuel-mixture control
• Many listed applications use two upstream sensors, so confirm the failed side before ordering

Fitment & Compatibility

Use the fitment table below to confirm the exact year and model before ordering. Sensor location and connector style need to match, especially on cars with separate left and right upstream sensors.

If you want us to verify the correct sensor location before you order, send us your VIN or fault-code details. We have been working with Porsche fitment and drivability parts for more than 20 years, and pre-cat sensor location is something we always check.