Porsche Cayenne front fog light bulbs use H11 size while rear fog light bulbs use P21W or P21/4W size. The replacement chart covers vehicle production years from 2003 to 2018 with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The H11 is a single-filament halogen bulb operating at 12V and 55W, fitted with a PGJ19-2 base. It follows the ECE standard, giving it approval across Europe and worldwide, as well as in the United States.
The Porsche Cayenne uses the H11 bulb for the front fog light position across the 2003-2006 and 2008-2018 model years.
The PGJ19-2 base on the H11 is a keyed, single-pin connector. Its physical design prevents substitution with other H-series bulbs that share similar wattage but carry different base configurations, such as the H8 or H9.
The rear fog light on the Porsche Cayenne uses two distinct bulb types depending on the model year. The P21W is specified for 2008-2010, while the P21/4W is specified for 2003-2006.
The P21W is a single-filament signalling bulb rated at 12V and 21W, using a BA15s bayonet base. The BA15s base features a single contact offset to one side, which mechanically distinguishes it from dual-contact bayonet bases.
The P21/4W is a dual-filament signalling bulb with a BAZ15d bayonet base, rated at 12V with filaments drawing 21W and 4W respectively. The BAZ15d base uses two offset contacts at unequal heights, a configuration that prevents incorrect installation of a single-filament P21W in its place.
Because the P21W and P21/4W share a similar cylindrical glass envelope and overall size, visual inspection alone is not a reliable method for distinguishing between them. The base type is the definitive differentiator.
All three bulb types specified across both fog light positions, the H11, P21W, and P21/4W, conform to ECE regulations, indicating a standardized approach to lighting components across the Cayenne's production span covered by these specifications.