Plymouth Neon front turn signal bulbs utilize 4157NA and 3157NA sizes, while rear turn signal bulbs require 3157 size specifications. The replacement chart covers 1995 through 2001 production years 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 Plymouth Neon front turn signal uses the 3157NA bulb for model years 1995-1999, then transitions to the 4157NA for 2000-2001.
The rear turn signal on the Plymouth Neon uses the 3157 bulb across all model years covered, from 1995-2001.
All three bulb types specified for the Plymouth Neon, the 4157NA, 3157NA, and 3157, are ANSI-standardized bulbs recognized in both the United States and Canada.
Each of the three bulb types is a dual-filament T25 wedge bulb rated at 12V with a 27W high filament and a 7W low filament, meaning one filament handles the brighter turn signal flash while the other serves a lower-intensity function such as parking or running light duty.
The 3157NA and 4157NA are distinguished from the standard 3157 by their natural amber glass envelope, which produces an amber light output without relying on a colored lens or housing to filter a clear bulb.
Despite the different ANSI part numbers, the 4157NA and 3157NA share identical electrical ratings and the same T25 wedge form, with the numeric difference reflecting a manufacturer or catalog distinction rather than a change in physical size or wattage.
Because the 3157 and 3157NA share the same base type and wattage, substituting one for the other in the Plymouth Neon rear turn signal position is an electrical match, though the amber tint of the NA variant would be absent in a clear 3157 installation.
The dual-filament design of all specified bulbs means a single bulb socket in each turn signal position serves more than one lighting function, which is a common arrangement in combined stop, turn, and parking light assemblies.