Kia Cadenza front turn signal uses 12496 or PY21W bulb size, while rear turn signal requires P21W bulb size. The chart covers 2017 to 2019 for replacement bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Kia Cadenza front turn signal position uses two distinct bulb types across the 2017-2019 model years, with the 2017 and 2019 models specifying the 12496 and the 2018 model specifying the PY21W, both applicable only to vehicles equipped with halogen capsule headlamps.
The 12496 is a manufacturer part number used by Philips and Osram rather than a universal ECE designation, classifying it as a specialty halogen bulb rated at 12V.
The PY21W follows the ECE lighting standard recognized across Europe and worldwide. It is a single-filament amber bulb operating at 12V and 21W, fitted with a BAU15s bayonet base.
The BAU15s base of the PY21W is offset, meaning it is not interchangeable with bulbs using the standard BA15s bayonet base despite sharing the same 21W power rating and general form.
The P21W also operates at 12V and 21W as a single-filament signalling bulb, but it uses a BA15s bayonet base rather than the offset BAU15s base found on the PY21W.
Because the PY21W and P21W share the same wattage but differ in base type, substituting one for the other is not physically compatible without modification.
The Kia Cadenza rear turn signal position uses the P21W consistently across all three model years from 2017-2019, with no conditional fitment notes attached to any of those entries.
The front turn signal specifications for 2017-2019 carry a halogen capsule headlamp condition, indicating that vehicles with a different headlamp configuration may not follow the same bulb fitment.