The Saab 9-3X front turn signal uses a P21W bulb size, while the rear turn signal requires either a PY21W or 12496 bulb size. The replacement chart covers 2010 to 2011 vehicle production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Saab 9-3X uses P21W bulbs for the front turn signal across both the 2010-2011 model years.
P21W is an ECE-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base.
The rear turn signal specification differs between the 2010 and 2011 model years, with each year requiring a different bulb type.
The 2011 Saab 9-3X rear turn signal uses the PY21W bulb, which is an ECE-standard amber single-filament bulb rated at 12V and 21W.
PY21W uses a BAU15s bayonet base, which is offset compared to the BA15s base of the P21W. These two bases are not interchangeable despite sharing the same 15mm pin spacing.
The 2010 rear turn signal uses the 12496, a Philips/Osram part number designation for a 12V halogen bulb intended for specialty applications.
Because the front and rear turn signal bulbs differ in base type and amber classification, substituting one for the other would result in an incorrect fitment.
The ECE designation on P21W and PY21W indicates conformance to European and international lighting regulations, which governs light output and color standards for signalling functions.