BMW X1 Turn Signal Bulb Size

BMW X1 front turn signal uses PY21W bulb size while rear turn signal requires P21W bulb size for replacement. The chart contains bulb size specifications covering 2012 to 2022 production years.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Front Turn Signal

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
2022	7507	PY21W	Check Price
2021	12496	12496	Check Price
2020	7507 (Not for vehicles with Adaptive LED headlight or LED headlight)	PY21W	Check Price
2019	12496	12496	Check Price
2017-2018	7507	PY21W	Check Price
2014-2016	12496	12496	Check Price
2012-2013	7507	PY21W	Check Price

Rear Turn Signal

Years	US Type	EU Type	Shop
2021-2022	1156	P21W	Check Price
2012-2019	1156	P21W	Check Price

Bulb Specifications

Description	Type	Shop
ECE standard (Europe & worldwide). Single-filament amber bulb with BAU15s bayonet base. 12V, 21W.	PY21W	Check Price
Philips/Osram part number. Halogen bulb, specialty application. 12V.	12496	Check Price
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W	Check Price
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156	Check Price

Other Locations

Additional Notes

The PY21W is an ECE-standard single-filament amber bulb rated at 12V and 21W, fitted with a BAU15s offset bayonet base. The offset pin placement of the BAU15s base physically prevents installation of non-amber bulbs, enforcing correct amber output for turn signal applications.
The P21W is also an ECE-standard single-filament bulb rated at 12V and 21W, but it uses a BA15s straight bayonet base rather than the offset BAU15s found on the PY21W. Despite sharing the same wattage and voltage rating, the two bulb types are not interchangeable due to their differing base configurations.
The 12496 is a part number used by Philips and Osram for a 12V halogen bulb designated for specialty applications. It serves as the front turn signal bulb on the BMW X1 for the 2014-2016 and 2019 and 2021 model years.
The rear turn signal position on the BMW X1 uses the P21W across all listed model years from 2012-2022, with no variation across that span.
The front turn signal position alternates between PY21W and 12496 across different model years, meaning the correct bulb type must be confirmed against the specific model year before replacement.
For the 2020 BMW X1, the PY21W front turn signal specification carries an explicit restriction: it does not apply to vehicles equipped with Adaptive LED headlights or LED headlights. This is the only model year in the specifications carrying a headlight-package-based fitment condition.