BMW X3 Turn Signal Bulb Size

Additional Notes

• The PY24WNA is an ANSI-standard amber bulb rated at 12V and 24W, fitted with a PGU20-4 base. It serves as the North American market equivalent of the ECE-standard PY24W, and the BMW X3 uses it across the front inner turn signal position for the 2007-2010 model years.
• The PY21W follows ECE standards and carries a BAU15s bayonet base, operating at 12V and 21W. Its base type is offset, which prevents it from being seated in sockets designed for the straight-pin BA15s base used by the P21W.
• The P21W also operates at 12V and 21W but uses a BA15s bayonet base rather than the offset BAU15s found on the PY21W. Despite sharing the same wattage rating, these two bulb types are not interchangeable due to their different base configurations.
• The BMW X3 rear turn signal position uses the P21W across the 2011-2019 model years, representing the longest uninterrupted run of a single bulb type across any position in these specifications.
• The 12496 is a Philips/Osram part number designating a 12V halogen bulb for specialty automotive applications. It appears across multiple positions and model years in the BMW X3 specifications, making it one of the most frequently referenced bulb types in this dataset.
• The 2015 BMW X3 front turn signal position requires different bulb types depending on headlamp configuration. Vehicles equipped with HID headlamps use the 12496, while those equipped with halogen capsule headlamps use the PY21W. This distinction makes headlamp type a critical factor when selecting a replacement bulb for that model year.
• The front turn signal position on the BMW X3 shows variation between the PY21W and 12496 across the 2011-2019 range, with no single bulb type covering the entire span. The 2019 model year returns to the PY24WNA, which is otherwise absent from the front turn signal position in all other listed years.
• The PY24WNA and PY21W are not interchangeable despite both being amber single-filament bulbs. The PY24WNA uses a PGU20-4 base and is rated at 24W, while the PY21W uses a BAU15s base and is rated at 21W, resulting in differences in both socket fit and power draw.
• The rear turn signal position on the BMW X3 used the 12496 for the 2004-2005 and 2008-2010 model years, and the PY21W for 2006-2007, before transitioning to the P21W from 2011 onward through 2019.
• The front inner turn signal position is only listed for the 2006-2010 model years. The 2006 model year uses the 12496 in that position, while the 2007-2010 model years use the PY24WNA.