Lincoln MKZ front turn signal bulbs use 3457NA or 3357NA sizes, while rear turn signal bulbs use 12272NA or 3157NA sizes, with each bulb size corresponding to specific vehicle applications. The replacement chart covers 2007 to 2012 model years and details bulb size specifications across the vehicle production range.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lincoln MKZ front turn signal uses the 3457NA bulb for 2007-2009 and 2011-2012, while the 2010 model year requires the 3357NA instead.
The 3457NA is a dual-filament T25 wedge bulb rated at 12V with a 27W main filament and a 7W secondary filament, constructed with natural amber glass to produce an amber output without a separate lens filter.
The 3357NA shares the same T25 wedge form factor and natural amber glass construction as the 3457NA but carries only a single filament rated at 27W, making the two bulbs non-interchangeable despite their physical similarity.
Both the 3457NA and 3357NA conform to ANSI standards recognized in the United States and Canada, classifying them as standardized replacements available across multiple manufacturers.
The rear turn signal on the Lincoln MKZ transitioned from the 3157NA, used in 2007-2009, to the 12272NA, used in 2010-2012.
The 3157NA is a dual-filament T25 wedge bulb rated at 12V, 27W/7W, with natural amber glass, and it also conforms to ANSI standards for the US and Canadian markets.
The 12272NA carries an OEM part number designation rather than an ANSI standard number, indicating it is a manufacturer-specific bulb rather than a universally catalogued replacement type.
The 12272NA is specified at 12V and includes a natural amber glass variant, though its filament configuration is not defined under a standardized wattage rating in the same way as the ANSI-numbered bulbs in these specifications.
The natural amber glass construction present across all four bulb types in these specifications produces the amber color required for turn signal use at the light source itself, rather than relying on a colored housing or lens.
Because the front turn signal position for the 2010 Lincoln MKZ calls for the single-filament 3357NA rather than the dual-filament 3457NA used in surrounding model years, substituting one for the other in that position would result in a filament count mismatch.