BMW X5 Turn Signal Bulb Size

Additional Notes

• The PY24WNA bulb is the most frequently specified front turn signal type across the BMW X5, covering model years 2009-2018. It operates at 12V and 24W, uses a PGU20-4 base, and conforms to ANSI standards for the US and Canadian markets as an amber variant of the ECE PY24W.
• For the BMW X5, front turn signal fitment for 2014-2018 carries an additional condition: the PY24WNA applies only to trims equipped with HID headlamps. The 2009-2013 model years list the same bulb without that restriction.
• The 3357NA appears in the front turn signal position for multiple model years and is a single-filament T25 wedge bulb rated at 12V and 27W. Its natural amber glass construction produces the required amber signal color without relying on a colored lens or coating.
• The 3457NA and 3457 are dual-filament T25 wedge bulbs rated at 12V with a 27W primary filament and a 7W secondary filament. The 3457NA variant uses natural amber glass, while the 3457 does not carry that designation, indicating a clear glass envelope.
• The 3357NA and 3457NA share the same T25 wedge form factor and primary wattage, but they are not interchangeable in all applications. The 3357NA is single-filament, while the 3457NA is dual-filament, meaning a socket wired for two circuits requires the 3457NA specifically.
• The P21W is the most frequently specified rear turn signal type across the BMW X5, appearing in model years 2000 and 2007-2013. It is an ECE-standard single-filament bulb with a BA15s bayonet base, rated at 12V and 21W.
• The PY21W, specified for the rear turn signal in the 2005 model year, uses a BAU15s bayonet base rather than the BA15s base of the P21W. These two bases are offset differently, making the PY21W and P21W physically non-interchangeable despite sharing the same wattage and voltage rating.
• The 12496 is a Philips or Osram part number used in the rear turn signal position for several model years. As a manufacturer-specific designation rather than an ANSI or ECE standard number, cross-referencing to a universal standard requires consulting manufacturer compatibility data.
• The 12180 and 12274NA are each specified for a single front turn signal model year. The 12180 is a Philips part number for a 12V halogen bulb, and the 12274NA is an OEM-designated natural amber glass variant, also at 12V. Neither carries a widely recognized ANSI or ECE standard designation.
• Across the full front turn signal specification range, four distinct bulb types are present: PY24WNA, 3357NA, 3457NA, and 3457, along with two manufacturer-specific part numbers. This variety across model years means bulb selection is year-specific and substitution between types risks electrical or fitment incompatibility.