Honda S2000 front and rear turn signal bulbs utilize 7440 size specifications, with rear applications also accommodating 12496 and PY21W bulb sizes. The replacement chart covers 2000 through 2009 model 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 7440 is the most frequently specified bulb across the Honda S2000 turn signal data, appearing in both front and rear positions across multiple model years.
The 7440 is an ANSI-standard single-filament wedge bulb in the T20 form factor, rated at 12V and 21W, and is the designated standard for the US and Canadian markets.
The Honda S2000 front turn signal position uses the 7440 bulb uniformly across all model years from 2000-2009.
The rear turn signal position on the S2000 shows variation across its production run, with three distinct bulb types specified depending on the model year.
The PY21W is an ECE-standard single-filament amber bulb with a BAU15s bayonet base, rated at 12V and 21W, and is associated with European and worldwide market variants of the S2000 for the 2001-2002 rear turn signal.
The BAU15s bayonet base of the PY21W is offset, meaning it is not physically interchangeable with the wedge-style 7440, even though both bulbs share the same 12V and 21W electrical ratings.
The 12496 is a Philips/Osram part number designating a 12V halogen bulb for specialty applications, specified for the S2000 rear turn signal in the 2000 and 2003 model years.
The rear turn signal of the 2004-2009 S2000 uses the 7440, aligning it with the front turn signal specification for those years.
The differing base types across the three rear turn signal bulbs mean that substitution between them requires verification of both electrical compatibility and physical fitment before installation.