The Mercedes-Benz SLK230 front fog light requires H7, 9006, or H1 bulb sizes, while the rear fog light uses a 1156 bulb size. The replacement chart covers 1998 to 2004 production 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 Mercedes-Benz SLK230 front fog light uses three different bulb types across its model years: H1 for 1998-2000, 9006 for 2001-2003, and H7 for 2004.
The H1 and H7 bulbs are ECE-standard halogen bulbs, meaning they originate from European and international regulatory frameworks, though both carry approval for use in the US and Japan as well.
The 9006 bulb follows the ANSI standard, which governs automotive lighting specifications in the US and Canada. It is not the same standard as the ECE system used by H1 and H7 bulbs.
Although the H1, H7, and 9006 bulbs all operate at 12V and 55W, they are not interchangeable. Each uses a distinct base type: P14.5s for H1, PX26d for H7, and P22d for 9006, making physical fitment incompatible across these three types.
The rear fog light on the SLK230 uses the 1156 bulb across all model years from 1998 through 2004, making it the most consistent bulb specification in this set of data.
The 1156 is an ANSI-standard single-filament bulb rated at 12V and 21W, which is notably lower wattage than the front fog light bulbs. It uses a BA15s bayonet base, a base type distinct from the screw or pin bases found in the front fog bulbs.
For the 2000, 1999, and 1998 model years, the rear fog light specification is split by vehicle identification number. Units built from ID F 171773 onward and units built up to ID F 171772 are both listed with the 1156 bulb, indicating a production-sequence distinction within those model years.
The single-filament design shared by all four bulb types in these specifications means each bulb serves only one lighting function, as opposed to dual-filament bulbs that can handle two functions such as stop and tail light simultaneously.