Hyundai Excel front turn signal bulbs use 1157 and P21W sizes, while rear turn signal bulbs use 1156 size. The replacement chart covers vehicle production spanning 1986 to 1994.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Hyundai Excel uses three distinct bulb types across its turn signal positions: the 1157, the P21W, and the 1156. All three operate at 12 volts and share a nominal 21W output rating for their primary filament, placing them within the same general power class for signalling applications.
The 1157 is a dual-filament bulb rated at 21W and 5W, built to the ANSI standard used in the United States and Canada. It uses a BAY15d bayonet base, which features two offset pins at different heights to prevent incorrect installation of the wrong filament orientation.
The P21W follows the ECE standard common in European and international markets. It is a single-filament bulb with a BA15s bayonet base, rated at 21W. The BA15s base uses two pins at the same height, distinguishing it physically from the BAY15d base of the 1157.
The 1156 is also a single-filament ANSI-standard bulb rated at 21W and shares the BA15s bayonet base with the P21W. Despite this base compatibility, the 1156 and P21W are not the same bulb, as they conform to different standards with potentially differing photometric and dimensional tolerances.
The front turn signal position of the Hyundai Excel uses the 1157 for model years 1987-1994. The 1986 model year uses the P21W in the same position, representing a specification difference between the 1986 unit and all subsequent years.
Because the 1157 has a BAY15d base and the P21W has a BA15s base, these two bulbs are not physically interchangeable despite both being used in the front turn signal position across different years of the same model.
The rear turn signal position uses the 1156 across all listed model years, from 1986 through 1994, without variation.
Although the 1156 and P21W share the BA15s base type, substituting one for the other across positions is not supported by the specifications, as each bulb is assigned to a specific position and year range within the fitment data.