The BMW 228i uses a PY21W bulb size for front turn signal applications and a P21W bulb size for rear turn signal functions. Replacement chart data covers 2014 through 2016 model 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 BMW 228i rear turn signal position uses the P21W bulb across all three model years covered in the specifications, from 2014-2016.
The P21W is an ECE-standard single-filament signalling bulb rated at 12V and 21W, fitted with a BA15s bayonet base.
The front turn signal position on the BMW 228i uses two different bulb types depending on the model year, with PY21W specified for 2014 and 2016, and bulb 12496 specified for 2015.
The PY21W is an ECE-standard amber single-filament bulb rated at 12V and 21W, fitted with a BAU15s bayonet base.
The BAU15s base of the PY21W and the BA15s base of the P21W are physically distinct from one another, meaning the two bulb types are not interchangeable despite sharing the same wattage and voltage rating.
The 12496 is a Philips/Osram part number designation for a 12V halogen bulb intended for specialty applications, used in the 2015 228i front turn signal position.
Because the 2015 front turn signal uses the 12496 designation rather than the PY21W, direct substitution with the PY21W specified for 2014 and 2016 is not confirmed by these specifications.