Also known as: Indicator bulb, Bulb, indicator, Turn Signal Bulb
OEM & aftermarket indicator bulb from top brands — compare prices, check fitment, order with free delivery
Shop 552 indicator bulb from 14 trusted brands including PHILIPS, ams-OSRAM, OSRAM. Compare prices, check vehicle compatibility, and get free delivery on orders over £99.
The direction indicator bulb — sometimes called a turn signal bulb — illuminates the amber indicator lens to signal a lane change or turn to other road users. UK law requires all direction indicators to flash at between 60 and 120 times per minute, and a failed bulb triggers the fast-flash 'bulb failure' warning on the dashboard. Modern vehicles use 12 V bayonet or wedge-base bulbs in W21W, PY21W, and WY21W base types, while many newer cars replace conventional bulbs with LED arrays. Osram and Philips supply high-quality OEM-specification direction indicator bulbs compatible with most European, Asian, and American vehicles. Replacing a failed indicator bulb takes under five minutes on most cars.
Indicator bulbs are amber or clear in colour — the lens colour determines which is needed. Using the wrong base type causes the bulb to sit at the wrong depth and flicker or fail prematurely. Always check the owner's handbook or use the vehicle registration lookup on CarParts247 to confirm the correct part.
Most indicator bulbs are accessible from inside the boot or engine bay via a twist-and-pull bulb holder. Some vehicles require partial removal of the headlamp or tail lamp unit. Always switch the ignition off before changing a bulb, and avoid touching the glass of halogen bulbs with bare fingers — skin oils cause hot spots that shorten bulb life.
Commonly searched OE numbers fitting Indicator Bulb from the TecDoc catalogue.
Common original equipment numbers linked to stocked alternatives.