Jaguar XF Turn Signal Bulb Size

Additional Notes

• The 3157NA and 3457NA bulbs share the same T25 wedge form factor, dual-filament construction, 12V operating voltage, and 27W/7W wattage rating. Despite these similarities, they carry distinct ANSI designations and are not listed interchangeably across the Jaguar XF fitment data.
• The 3157NA bulb is specified for the Jaguar XF Front Outer Turn Signal across the 2009-2015 model years, making it the most consistently recurring bulb type across the widest span of years in these specifications.
• The 12174NA is an OEM-designated natural amber halogen bulb rated at 12V. It is specified for the Front Turn Signal position on the XF for the 2016-2018 and 2021 model years.
• The 12174SV is a Philips SilverVision part carrying an enhanced coating and a 12V rating. It is specified for the Front Turn Signal on the 2023-2024 XF and for the Front Outer Turn Signal on the 2021 XF, meaning the 2021 model year uses two distinct 12174-series bulbs across those two positions.
• The 12174NA and 12174SV share the same base part number structure but differ in their coatings and designations. The SilverVision variant replaces the natural amber variant in the Front Turn Signal position between the 2021 and 2023 model years.
• The 12275 is a Philips-designated halogen bulb rated at 12V for specialty applications. It is the sole bulb specified for the Rear Turn Signal position across the 2009-2015 XF model years.
• The Front Turn Signal position on the 2009-2011 XF uses the 3457NA, while the Front Outer Turn Signal on those same years uses the 3157NA, indicating that two separate T25 dual-filament bulbs with different ANSI codes are required simultaneously on those vehicles.
• The natural amber glass construction of the 3157NA, 3457NA, and 12174NA bulbs produces an amber-tinted output without the use of an amber lens, which is a common method of meeting turn signal color requirements at the bulb level rather than through the housing.