Jaguar S-Type front turn signal bulbs use 3357NA or 3457NA size, while rear turn signal bulbs use PY21W or 12496 size. The replacement chart covers 2000 through 2008 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Jaguar S-Type front turn signal uses two distinct bulb types across its production years: the 3357NA for 2000-2001 and 2007-2008, and the 3457NA for 2002-2006.
The 3357NA is an ANSI-standard single-filament wedge bulb in the T25 form factor, rated at 12V and 27W, with natural amber glass that produces the required amber color without a separate amber lens.
The 3457NA shares the same T25 wedge form factor and natural amber glass as the 3357NA but carries a dual-filament design rated at 27W and 7W, making it capable of serving both a primary and a secondary lighting function.
Although the 3357NA and 3457NA share the same T25 wedge base and voltage rating, they are not interchangeable in all applications due to the filament count difference; the 3457NA has a second 7W filament that the 3357NA lacks.
The rear turn signal of the Jaguar S-Type uses the PY21W for 2000, 2002, and 2005-2008, while the 12496 appears in 2001, 2003, and 2004.
The PY21W follows the ECE standard used in Europe and worldwide markets, featuring a BAU15s offset bayonet base rated at 12V and 21W; the offset pin arrangement of the BAU15s base prevents accidental substitution with non-amber bulbs sharing a similar base style.
The 12496 is a Philips/Osram part number designation rather than an ANSI or ECE standard code, indicating a proprietary or specialty halogen bulb rated at 12V for a specific application.
The front turn signal positions across all model years covered in the specifications use only ANSI-coded bulbs, while the rear turn signal positions draw from both ECE-standard and manufacturer-specific part numbers.
Natural amber glass, as used in the 3357NA and 3457NA, is a construction method where the amber tint is built into the glass envelope itself rather than applied as a coating, which is the basis for the "NA" suffix in both part numbers.
The BAU15s bayonet base of the PY21W has an offset pin spacing of 7.5 degrees, distinguishing it from the standard BA15s base; this offset is a deliberate design feature to ensure only amber-rated bulbs are seated in amber-designated sockets.