Honda Fit Turn Signal Bulb Size

Additional Notes

• The T20 wedge bulb family is the most prevalent type across the Honda Fit turn signal specifications, appearing in both front and rear positions across the majority of model years covered.
• Within the T20 family, the "NA" suffix denotes natural amber glass, meaning the bulb produces an amber color through its tinted envelope rather than relying on an amber-painted or clear lens housing to achieve the required signal color.
• The 7440 and 7440NA are both single-filament T20 wedge bulbs rated at 12V and 21W, differing only in whether the glass envelope is amber-tinted. These two types are not directly interchangeable in applications where the housing itself is clear, as the non-NA variant would require an amber lens to meet signaling color standards.
• The 7443NA and 7444NA are dual-filament T20 wedge bulbs rated at 12V, 21W/5W, with the lower 5W filament typically serving a parking or daytime running light function alongside the 21W turn signal filament. Despite their similar designations, the 7443NA and 7444NA differ in their base configuration and are not interchangeable with each other.
• The Honda Fit (2015-2018) front turn signal uses the 7443NA, while the 2019-2020 model years use the 7444NA. Substituting one for the other without confirming socket compatibility risks an improper fit or electrical mismatch.
• The rear turn signal on the Honda Fit follows a distinct split: the 2015-2020 model years use the standard 7440 (clear glass), while the 2007-2012 model years use the 7440NA (amber glass). These two bulbs share the same wattage and base type but differ in glass tint, making the correct choice dependent on the lens housing color of the specific vehicle.
• The 2009 Honda Fit front turn signal specifies the PY21W, an ECE-standard bulb with a BAU15s bayonet base. This base type is offset and distinct from the wedge base used by the T20 family, making PY21W bulbs physically incompatible with sockets designed for 7440 or 7443/7444 series bulbs.
• The 12496 is a Philips/Osram proprietary part number rather than an ANSI or ECE standard designation, and it applies to the front turn signal on the 2010-2012 Honda Fit. Its specialty application classification indicates it does not share a common base or form factor with the T20 wedge bulbs used in adjacent model years.
• The front turn signal position on the Honda Fit shows greater variation in bulb type across model years than the rear, with four distinct bulb specifications used between 2007 and 2020, compared to two for the rear position over the same span.
• Because the 7443NA and 7444NA are dual-filament bulbs while the 7440 and 7440NA are single-filament, using a single-filament bulb in a socket wired for dual-filament operation would result in the loss of one lighting function, such as the parking light circuit.