This Bosch downstream oxygen sensor is a direct-fit replacement for Porsche 996 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. On the 996 cars covered here, part 16541 is the after-catalyst sensor used to monitor catalyst efficiency, not the upstream mixture-control sensor ahead of the converter. If you are tracking a rear oxygen sensor fault or replacing tired original sensors during exhaust work, this is the Bosch OE-style part you want. Technical Details Manufacturer part number: 16541 Type: Direct-fit oxygen sensor Position: Downstream / after catalyst OE reference: 99660617802 Side: Left or right depending bank Fitment & Compatibility Use the fitment table below to confirm year and model. On 996 applications, make sure you are ordering the downstream sensor and not the pre-cat sensor at the exhaust manifold. If you want us to check fitment before you order, send over your VIN. We have been helping with Porsche parts for over 20 years, and we still treat fitment questions like they matter. Year Make Model Submodel Notes 2003 Volvo XC90 T6 2004 Volvo XC90 T6 2005 Volvo XC90 T6 2004 Porsche 911 40th Anniversary Edition 2002 Porsche 911 Carrera 2003 Porsche 911 Carrera 2004 Porsche 911 Carrera 2005 Porsche 911 Carrera 2002 Porsche 911 Carrera 4 2003 Porsche 911 Carrera 4 2004 Porsche 911 Carrera 4 2002 Porsche 911 Carrera 4S 2003 Porsche 911 Carrera 4S 2004 Porsche 911 Carrera 4S 2005 Porsche 911 Carrera 4S 2005 Porsche 911 Carrera S 2004 Porsche 911 GT3 2005 Porsche 911 GT3 2002 Porsche 911 Targa
