Audi Q5 Turn Signal Bulb Size

Additional Notes

• The 12174NA bulb is a 12V halogen unit with natural amber glass and appears across the Audi Q5 front turn signal position for the 2019 and 2023-2024 model years. Its amber coloring is achieved through tinted glass rather than a coated or clear envelope, which is a characteristic of the NA designation in this part series.
• The 2021 Audi Q5 front turn signal uses the 12174SV, a Philips SilverVision variant of the same base bulb family as the 12174NA. The SilverVision designation indicates an enhanced coating on the halogen envelope, making it a non-interchangeable substitute for the 12174NA despite sharing the same voltage rating and general application.
• The 12188 is a 12V Philips halogen bulb classified for specialty applications and serves as the front turn signal bulb for the 2013-2018 model years. The 2018 fitment is specifically noted as applying to vehicles equipped with HID headlamps, indicating that headlamp technology on that model year influences front turn signal bulb selection.
• The 12272NA is a 12V natural amber glass halogen bulb used in the front turn signal position for the 2009-2012 model years. Like the 12174NA, its amber output is produced by the glass itself rather than by a phosphor or coating treatment.
• The PY21W is an ECE-standard single-filament amber bulb rated at 12V and 21W, fitted with a BAU15s offset bayonet base. The offset pin configuration of the BAU15s base physically prevents installation of non-amber bulbs with a standard BA15s base, enforcing correct amber output in markets where this standard applies.
• The 7506 and 7507 designations appear in the rear turn signal position across multiple model years. Both are single-filament bulbs in the same general family, though they are not rated identically and are not considered interchangeable without confirming wattage and base compatibility for the specific application.
• The 2017 Audi Q5 rear turn signal fitment is split by both position and VIN range. The upper position uses the 7506, while the lower position uses the PY21W, with the lower fitment further divided between vehicles up to VIN FP-H-150 000 and those from VIN FY-H-000 001, reflecting a mid-production specification change.
• For the 2015-2016 model years, the rear turn signal assembly of the Audi Q5 requires two distinct bulb types simultaneously: the 7506 for the upper position and the PY21W for the lower position. Substituting one for the other across positions would not satisfy the original equipment specification for either location.