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LED bulbs with BA15S socket (P21W/1156) – replacement for single filament bulbs in turn signals, reverse lights and brake lights. CANbus compatible variants that work without error codes. BA15S has a simple connector with staggered pins for correct orientation. Available in amber (turn signals), white (reverse lights) and red (brake lights).
LED bulbs with BA15S socket (P21W/1156) – replacement for single filament bulbs in turn signals, reverse lights and brake lights. CANbus compatible variants that work without error codes. BA15S has a simple connector with staggered pins for correct orientation. Available in amber (turn signals), white (reverse lights) and red (brake lights).

BA15S (also called P21W or 1156) is one of the most common sockets in cars. It is used in single-filament lamps for turn signals (front and rear), reversing lights, rear fog lights and in some cars also as brake lights (single function). The socket has a bayonet fitting with two prongs that are offset at an angle – this means that the lamp can only be inserted one way.
Amber/orange – for turn signals. Legal requirement that the turn signal light should be orange. White – for reversing lights and other white functions. Red colour – for brake lights and tail lights. Check what color your existing lamp is and choose the same.
Do not confuse BA15S with BAY15D (P21/5W) – it has two filaments (brake + tail light in the same bulb) and the pins are at different heights. Questions? Contact us.