Volkswagen Atlas front turn signal bulbs use 12174NA or 12174SV size, while rear turn signal bulbs use PY21W or 12496 size. The replacement bulb chart covers 2018 through 2024 production years with corresponding size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The front turn signal positions on the Volkswagen Atlas use two variants of the 12174 bulb family across the 2021-2024 model years, with the 12174NA and 12174SV sharing the same base designation but differing in glass treatment and coating technology.
The 12174NA is a 12V bulb with natural amber glass, meaning the amber color is produced by the glass itself rather than by a coating or lens filter. It appears in the 2023-2024 front turn signal position.
The 12174SV is a Philips SilverVision part carrying an enhanced coating over a halogen element, operating at 12V. It was specified for the 2021 front turn signal position, making it a distinct fitment from the 12174NA used in later years despite the shared 12174 base number.
Because the 12174NA and 12174SV carry different part numbers and coatings, substituting one for the other across model years may not constitute a direct equivalent replacement, even though both operate at 12V.
The PY21W is an ECE-standard bulb rated at 12V and 21W, fitted with a BAU15s offset bayonet base. The offset pin arrangement of the BAU15s base physically prevents installation of non-offset BA15s bulbs, making base type a critical fitment factor for the 2020 rear turn signal position.
The 12496 is a 12V halogen bulb classified under a specialty application designation by Philips and Osram. It was specified for the rear turn signal on the 2018-2019 Atlas.
The rear turn signal position spans three different bulb types across the 2018-2020 model years, with the 12496 used in 2018-2019 and the PY21W used in 2020, indicating these positions are not interchangeable across those years.
All six bulb specifications across both the front and rear turn signal positions operate on a 12V electrical system, which is standard for passenger vehicle lighting circuits.