Smart Fortwo front fog light bulbs use H16 or H11 size, while rear fog light bulbs use P21W size. The replacement chart covers 2008 to 2018 model years 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 Smart Fortwo front fog light uses two distinct bulb types across its model years. The H11 bulb is specified for 2008-2015, while the H16 bulb is specified for 2016-2018.
The H11 is a single-filament halogen bulb operating at 12V and 55W, fitted with a PGJ19-2 base. It holds ECE approval for use in Europe and worldwide, and also carries approval for use in the United States.
The H16 is a single-filament halogen bulb operating at 12V and 19W, fitted with a PGJ19-3 base. It is rated under the ECE standard for Europe and worldwide use.
Although the H11 and H16 share a similar physical profile, their base types differ. The H11 uses a PGJ19-2 base and the H16 uses a PGJ19-3 base, which means the two bulbs are not interchangeable despite their visual resemblance.
The wattage difference between the H11 at 55W and the H16 at 19W is substantial. Substituting one for the other would affect both electrical load and light output in the front fog light housing.
The rear fog light of the Smart Fortwo uses the P21W bulb across all listed model years from 2008-2018.
The P21W is a single-filament signalling bulb operating at 12V and 21W. It uses a BA15s bayonet base and is rated under the ECE standard for Europe and worldwide use.
For the Smart Fortwo (2016-2018), the P21W rear fog light specification carries a conditional note indicating it applies to vehicles without LED tail lights. This signals a fitment variation based on the tail light configuration of the specific vehicle.