Audi S5 Sportback Turn Signal Bulb Size

Additional Notes

• The 12174NA is an OEM part number designating a natural amber glass bulb operating at 12 volts. The amber coloring is built into the glass itself, which produces the required turn signal color without relying on a tinted lens or external filter.
• The 12174SV is a Philips SilverVision part number for an enhanced coating halogen bulb, also rated at 12 volts. The SilverVision coating gives the bulb a silvered appearance when unlit while still producing the necessary amber output when energized.
• The Audi S5 Sportback front turn signal uses the 12174NA for the 2023-2024 model years, indicating consistent fitment across that period.
• The 2021 model year front turn signal uses the 12174SV rather than the 12174NA, meaning the two part numbers are not interchangeable across all model years despite both operating at 12 volts.
• The 2019 model year front turn signal specifies the 12174NA exclusively for vehicles equipped with HID headlamps, indicating that headlamp type is a relevant fitment variable for that year.