Honda CR-V Turn Signal Bulb Size

Additional Notes

• The 7440NA bulb is the most frequently specified type across the Honda CR-V turn signal application. It is a single-filament T20 wedge bulb rated at 12V and 21W, built to the ANSI standard for the US and Canadian markets. Its natural amber glass produces the required amber signal color without relying on a colored lens.
• The "NA" suffix on bulbs such as 7440NA, 7443NA, 1157NA, and 1034NA denotes natural amber glass, which is an ANSI-defined variant. The base bulb type without this suffix uses clear glass instead, meaning the amber color must be provided by the housing lens rather than the bulb itself.
• The 7443NA and 7443 are dual-filament T20 wedge bulbs rated at 12V, 21W/5W, making them physically similar to the 7440NA and 7440 but electrically distinct due to the second filament. The Honda CR-V (2015-2016) front turn signal position uses the 7443NA, while the 7440NA single-filament type is used in other years at the same position. These two bulb types are not interchangeable despite sharing the same T20 wedge base form factor.
• The 1157NA and 1034NA are both dual-filament bulbs with a BAY15d bayonet base, rated at 12V, 21W/5W. The 1034NA is a variant of the 1157 type. These bulbs use a bayonet mount rather than a wedge base, meaning they are physically incompatible with T20 wedge sockets used by the 7440 and 7443 families.
• For the Honda CR-V front turn signal, the 2013 and 2001 model years specify the 1034NA, while 2014, 2012, 2000, and 1999 specify the 1157NA. Both are dual-filament BAY15d bayonet bulbs, but the 1034NA and 1157NA have different current draw characteristics and are not considered direct substitutes despite sharing the same base type.
• Rear turn signal fitment for the Honda CR-V diverges by vehicle origin for the 2002-2006 model years. Units originating from Japan use T20 wedge-base bulbs in the 7440 family, while units originating from Great Britain use ECE-standard bayonet bulbs: PY21W with a BAU15s base for 2006, and P21W with a BA15s base for 2002-2004. The BAU15s and BA15s bases are offset differently and are not interchangeable with each other or with T20 wedge sockets.
• The PY21W is an ECE-standard single-filament amber bulb with a BAU15s offset bayonet base, rated at 12V, 21W. The P21W is also an ECE-standard single-filament bulb rated at 12V, 21W, but uses a BA15s straight bayonet base and produces white light, relying on an amber lens for signal color. These two bulbs serve the same wattage function but have different base configurations and color outputs.
• The 12496 designation is a Philips/Osram part number rather than an ANSI or ECE standard code, and it applies to the 2005 rear turn signal position on Great Britain-origin Honda CR-V units. It is rated at 12V and classified as a specialty halogen application, distinguishing it from the standardized bulb codes used across all other positions in the specifications.