Peugeot 505 front and rear turn signal bulbs utilize a P21W size across all configurations. The replacement chart covers vehicle production spanning 1980 to 1991.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Peugeot 505 uses the P21W bulb type across all listed model years for both front and rear turn signals, spanning the 1980-1991 production range.
The P21W is an ECE-standardized bulb, meaning its specifications conform to European and internationally recognized automotive lighting regulations rather than SAE standards used in North America.
The P21W operates at 12 volts and draws 21 watts, which places it in the standard single-filament signalling category used for dedicated turn signal and brake light applications.
The BA15s bayonet base of the P21W features a single contact pin offset to one side, which physically prevents incorrect installation of double-contact variants such as the BA15d.
Because the P21W is a single-filament bulb, each turn signal position on the Peugeot 505 uses a dedicated bulb solely for that function, rather than a shared dual-filament unit.
The front and rear turn signal positions on the Peugeot 505 share the same P21W specification, meaning the same bulb type serves both locations across the entire 1980-1991 model range.
The BA15s base designation indicates a bayonet cap with a 15mm base width and a single contact, distinguishing it from visually similar bases that are electrically or mechanically incompatible.
Substituting a dual-filament BA15d bulb in place of the specified BA15s P21W is not possible without modification, as the pin configuration of the two base types differs.