Porsche Cayman front fog light bulbs use H11 size while rear fog light bulbs use P21/4W size. The replacement chart covers 2006 through 2012 model years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The H11 is the front fog light bulb type for the Porsche Cayman across all listed model years, spanning 2006-2012.
The H11 is a single-filament halogen bulb operating at 12V and 55W, built to ECE standards for use in Europe and worldwide markets, with approval also extended to the United States.
The H11 uses a PGJ19-2 base, a proprietary connector type that is not interchangeable with other common halogen bases such as H9 or H8, despite those bulbs sharing a physically similar housing profile.
The rear fog light on the Porsche Cayman (2006-2008) uses the P21/4W bulb type.
The P21/4W is a dual-filament signalling bulb rated at 12V, with one filament drawing 21W and the other drawing 4W, allowing it to serve two distinct lighting functions within a single unit.
The P21/4W uses a BAZ15d bayonet base, which features offset pins to ensure correct polarity orientation during installation. This base is not interchangeable with the more common BA15s or BAY15d bases despite the physical similarities of the bayonet fitting style.
The rear fog light specification covers only 2006-2008, while the front fog light specification extends through 2012, reflecting different fitment data ranges for each sub-part.
Both the H11 and P21/4W conform to ECE regulations, indicating that the Cayman's fog lighting system was engineered to meet European homologation standards.