Hyundai Ioniq Map Light Bulb Size

The Hyundai Ioniq map light utilizes 168 and 904 bulb sizes for the interior lighting system. Data for the specific components covers the period from 2017 through 2020.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
2020	168 (With Halogen Capsule Headlamps)	W5W	Check Price
2019	168	W5W	Check Price
2018	904 (Front)	904	Check Price
2017	904 (Front, To 2/1/2017)	904	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168	Check Price
ECE standard (Europe & worldwide). Single-filament signalling bulb with W2.1x9.5d wedge base. 12V, 5W.	W5W	Check Price
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	904	Check Price

Other Locations

Additional Notes

Both bulb types referenced in these specifications, the 168 and the 904, are ANSI-standardized miniature wedge bulbs sharing the T10 form factor and a 12-volt operating voltage, making them physically interchangeable in terms of socket fit.
Despite the shared T10 form factor, the 168 and 904 differ in wattage. The 168 draws 4.9W, while the 904 draws 8W, meaning a direct substitution between the two would alter the power draw of the map light circuit.
The 2019-2020 Hyundai Ioniq uses the 168 bulb for the map light, with the 2020 model year specifying this size specifically under the halogen capsule headlamp configuration.
The 2017-2018 Ioniq uses the higher-wattage 904 bulb for the front map light position, distinguishing it from the later model years that transitioned to the 168.
The 2017 specification carries a production cutoff of February 1, 2017, indicating that vehicles built after that date may not follow the same 904 fitment and could require a different bulb size.