Alfa Romeo 4C Turn Signal Bulb Size

Alfa Romeo 4C front inner turn signal requires PY24WNA bulb size while rear turn signal uses P21W bulb size. The chart covers 2015 to 2020 production years with replacement bulb specifications.

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

Front Inner Turn Signal

YearsBulb Size
2015-2020PY24WNA

Rear Turn Signal

YearsBulb Size
2015-2020P21W

Bulb Specifications

Description Bulb Size
ANSI standard (US & Canada). Amber variant of ECE PY24W with PGU20-4 base. 12V, 24W.PY24WNA
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.P21W

Other Locations

Additional Notes