The Maserati 228i uses 1156 bulb size for both front and rear turn signal applications. The replacement chart covers 1989 to 1990 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 1156 is the sole bulb type listed for the Maserati 228i across both front and rear turn signal positions for the 1989-1990 model years.
The 1156 is a single-filament bulb, meaning it serves one lighting function only, which makes it suited to dedicated turn signal circuits rather than combined stop/turn applications.
The 1156 operates at 12 volts and draws 21 watts, placing it within the standard range for incandescent automotive signal lighting.
The 1156 uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin, distinguishing it from the dual-contact BA15d base used on other bulb types.
The 1156 conforms to ANSI standards and carries approval for use in both the United States and Canada.
Because the front and rear turn signal positions on the 228i share the same 1156 specification, a single bulb type covers all four turn signal sockets on the vehicle.
The BA15s base is not interchangeable with the BA15d base; substituting a dual-contact bulb such as the 1157 into a BA15s socket is not supported by these specifications.