The Dodge Nitro front turn signal uses a 3157NA bulb size, while rear turn signals require either 3057 or 4057 bulb sizes. The replacement chart covers 2007 through 2011 model years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Dodge Nitro front turn signal uses the 3157NA bulb across all model years covered in the specifications, from 2007-2011.
The 3157NA is a dual-filament T25 wedge bulb rated at 12V with a 27W high filament and 7W low filament, built to ANSI standards for use in the US and Canada.
The "NA" suffix in the 3157NA designation indicates natural amber glass, meaning the bulb produces an amber output without relying on a colored lens to achieve the required turn signal color.
The Dodge Nitro rear turn signal uses two different bulb sizes depending on the model year: the 4057 for 2007-2009 and the 3057 for 2010-2011.
Both the 3057 and 4057 are dual-filament T25 wedge bulbs rated at 12V, 27W/7W, and both conform to ANSI standards, making their electrical characteristics identical.
Despite sharing the same voltage, wattage, filament count, and base type, the 3057 and 4057 are not confirmed as interchangeable in these specifications, and the year-specific fitment data reflects a distinction between them for the Nitro rear turn signal position.
The 3157NA used at the front and the 3057 and 4057 used at the rear all share the T25 wedge base form factor and the same 12V, 27W/7W ratings, yet they are listed as separate part numbers occupying separate positions on the vehicle.
The front position calls for the natural amber glass variant (3157NA) rather than a clear-glass equivalent, which is a fitment-specific detail relevant when sourcing a replacement bulb for that position.