The Kia Niro brake bulb specifications include LED and P21/5W sizes for standard brake applications, 194 size for inner brake functions, and LED configuration for the center high mount stop light. The replacement chart covers vehicle production years from 2017 to 2024 with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Kia Niro uses two distinct brake bulb types across its model years: the P21/5W for the main brake light on 2017-2022 models, and the 194 for the inner brake position on those same years.
The P21/5W is an ECE-standard dual-filament bulb rated at 12V with a 21W main filament and a 5W secondary filament, mounted via a BAY15d bayonet base. The dual-filament design allows a single bulb to serve both a steady running light function and a brighter brake light function.
The 194 is an ANSI-standard miniature wedge bulb of the T10 type, rated at 12V and 3.78W. Its low wattage reflects its role as an inner brake position indicator rather than a primary stop light source.
The BAY15d bayonet base of the P21/5W features two offset pins, which physically prevent incorrect single-filament bulbs from being inserted. Substituting a single-filament bulb in a BAY15d socket would result in loss of either the running light or the brake light function.
The 194 wedge bulb uses a T10 form factor, which is among the most widely produced miniature automotive bulb formats. Aftermarket LED replacements in this form factor are broadly available, though compatibility with the vehicle's electronics is not guaranteed by the specification alone.
For the 2023-2024 Kia Niro, the main brake light and the center high mount stop light are both listed as LED non-replaceable units, meaning the light assembly itself must be serviced rather than an individual bulb.
The non-replaceable LED designation on 2023-2024 models applies to both the standard brake position and the center high mount stop light, indicating that the LED elements are integrated directly into sealed assemblies.
The 2017-2022 model years share an identical brake bulb configuration, with the P21/5W in the main brake position and the 194 in the inner brake position, indicating no mid-generation changes to the bulb specification during that period.