The Mercedes-Benz G500 front inner and front turn signal bulbs use 1156NA or PY21W size, while rear turn signal bulbs require 12496 or PY21W size. The replacement chart covers 2002 through 2008 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 1156NA and PY21W bulbs share the same 12V, 21W electrical rating, but they are not interchangeable. The 1156NA uses a BA15s bayonet base with straight pins, while the PY21W uses a BAU15s bayonet base with offset pins. The physical base difference prevents cross-fitting between the two types.
The 1156NA follows the ANSI standard used in North America, whereas the PY21W follows the ECE standard used in Europe and other international markets. The presence of both types across the Mercedes-Benz G500 model range reflects regional production variants.
The 1156NA produces its amber color through natural amber-tinted glass, while the PY21W achieves its amber output through an amber-coated or amber-glass bulb body. Both are single-filament designs intended solely for turn signal or similar single-function applications.
For the Front Turn Signal on the Mercedes-Benz G500, model years 2002-2007 carry two separate bulb specifications split by vehicle ID. Units built from ID 144226 onward take the 1156NA, while units built up to ID 144225 take the PY21W. Selecting the correct bulb requires confirming the vehicle's production ID before purchase.
The 2008 Front Turn Signal moved exclusively to the 1156NA, with no ID-based split listed for that year, indicating a single specification applied across all 2008 Front Turn Signal positions.
The Front Inner Turn Signal position uses the 1156NA for model years 2004-2007 and the PY21W for model years 2002-2003, with no production ID qualifier noted for either group in that position.
The Rear Turn Signal specification is not uniform across the model range. The PY21W is listed for 2002-2003, 2005-2007, while the 12496 appears for 2004 and 2008, indicating that the rear position has used at least two distinct bulb types at different points in the production run.
The 12496 is a Philips/Osram part number designation rather than an ANSI or ECE standard code. It is rated at 12V and classified as a halogen specialty application bulb. Its wattage is not specified in the provided data.
Because the Front Turn Signal position on 2002-2007 vehicles is split by production ID, two vehicles of the same model year may require different bulbs depending solely on their individual build sequence number.
All three bulb types listed across the G500 turn signal specifications operate on a 12V electrical system, consistent with standard automotive low-voltage architecture.