The Mercedes-Benz E550 parking light requires a 12961 bulb size for the specific lighting component located on the exterior of the vehicle. Data for the bulb specifications covers the range from 2007 through 2012.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mercedes-Benz E550 uses the 12961 bulb across all listed model years for the front parking light position, spanning 2007-2013.
The 12961 is a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12 volts and 5 watts.
The T10 form factor is a small tubular wedge-type bulb commonly used in low-intensity automotive lighting applications such as parking lights and marker lights.
The W2.1x9.5d base designation refers to a wedge-style base with a 2.1mm wire contact width and a 9.5mm pin spacing, which determines physical socket compatibility.
At 5 watts, the 12961 operates at a low wattage consistent with its role as a parking or position light rather than a primary illumination source.
For the 2007-2012 Mercedes-Benz E550, a separate fitment entry specifies the 12961 bulb for vehicles equipped with halogen capsule headlamps, indicating that headlamp type is a relevant compatibility variable for those model years.
The halogen capsule headlamp condition is noted across 2007-2012 entries, meaning vehicles from those years with a different headlamp configuration may fall under a distinct fitment category not reflected in these specifications.
The 12961 bulb size is consistent across both the standard and halogen capsule headlamp entries, meaning the same physical bulb applies regardless of which of those two fitment conditions is present.