Ferrari F40 front and rear turn signal bulbs utilize P21W and 1156 sizes respectively. The replacement chart covers 1990 to 1992 production 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 Ferrari F40 uses two distinct turn signal bulb standards across its front and rear positions for the 1990-1992 model years, with the front using the P21W and the rear using the 1156.
The P21W is an ECE-standard bulb used in European and worldwide markets, operating at 12V with a 21W output and a single filament.
The 1156 is an ANSI-standard bulb used in the US and Canadian markets, also rated at 12V and 21W with a single filament.
Both the P21W and the 1156 share the BA15s bayonet base, a single-contact base type identified by its 15mm collar width and single locating pin.
Despite sharing the same base type, voltage, and wattage, the P21W and 1156 are governed by different regional standards and are not interchangeable across front and rear positions as specified for the Ferrari F40.
The single-filament design of both bulb types indicates they serve a dedicated signalling function, as opposed to dual-filament bulbs that combine stop and tail light duties in a single unit.
The front turn signal position on the Ferrari F40 calls for the P21W across all three listed model years, reflecting a consistent application of the ECE standard at that position.
The rear turn signal position on the Ferrari F40 calls for the 1156 across all three listed model years, reflecting a consistent application of the ANSI standard at that position.