The Volvo 142 front and rear turn signal bulbs both utilize a 1156 size bulb for proper operation. The replacement chart covers vehicle production spanning 1967 to 1974.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Volvo 142 uses the 1156 bulb for both front and rear turn signals across all listed model years, 1967-1974.
The 1156 is an ANSI-standardized bulb type, meaning its physical and electrical specifications are defined by a recognized North American standard used in the United States and Canada.
The 1156 bulb operates on a 12-volt electrical system and draws 21 watts, which is typical for incandescent automotive turn signal applications.
As a single-filament bulb, the 1156 is designed for functions requiring only one light output state, such as turn signals, rather than dual-intensity functions like combined stop and tail lighting.
The 1156 uses a BA15s bayonet base, where "BA15s" denotes a single-contact bayonet fitting with a 15mm base width. The single-contact design corresponds directly to the single-filament construction of the bulb.
Because the Volvo 142 uses the same 1156 bulb for both front and rear turn signal positions across all listed years, the same bulb type serves all four turn signal sockets on the vehicle.
The BA15s base is not interchangeable with the BA15d base, which is a dual-contact bayonet fitting used on two-filament bulbs. Substituting a BA15d bulb into a BA15s socket is not physically compatible.