The Volvo 740 front and rear side marker bulb size specifications include 1157NA, P21/5W, 1034NA for front applications and P21/5W, 3893 for rear applications. The replacement chart covers 1988 to 1992 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 Volvo 740 front and rear side marker positions draw exclusively from dual-filament bulb types across all listed model years, meaning each socket carries two independent filaments within a single envelope.
Three of the four bulb types specified for the Volvo 740, namely the 1157NA, P21/5W, and 1034NA, share identical electrical ratings of 12V with a 21W/5W filament configuration, indicating the high-intensity filament draws 21 watts and the low-intensity filament draws 5 watts.
All four bulb types across both marker positions use the BAY15d bayonet base, a two-pin offset base design where the two pins are positioned at different heights to prevent incorrect insertion orientation.
The 1157NA and P21/5W types differ primarily in their regulatory standard of origin. The 1157NA follows the ANSI standard used in the United States and Canada, while the P21/5W follows the ECE standard used in Europe and internationally, though both share the same voltage, wattage, and base configuration.
The 1034NA, specified for the Volvo 740 front side marker in 1988-1989, is documented as a variant of the 1157 type. It carries natural amber glass and the same 12V, 21W/5W ratings, distinguishing it from the standard 1157 primarily by its amber-tinted envelope rather than a clear one.
The 1157NA, specified for the front side marker in 1992, also features natural amber glass. This amber coating filters the light output at the bulb level rather than relying solely on a colored lens to produce the required amber signal.
The 3893 bulb, specified for the Volvo 740 rear side marker in 1990-1991, follows the ANSI standard and shares the BAY15d base with the other types listed, though its wattage values are not detailed in the specifications beyond the 12V operating voltage.
The front side marker position on the Volvo 740 uses three different bulb types across the 1988-1992 span, with the 1034NA covering 1988-1989, P21/5W covering 1990-1991, and 1157NA covering 1992, indicating the socket fitment remained physically consistent due to the shared BAY15d base even as the specified bulb type changed.
The rear side marker position similarly rotates across bulb types, with P21/5W specified for 1988-1989, 3893 for 1990-1991, and P21/5W again for 1992, reflecting a non-linear pattern of type assignment across the production years covered.
Because the 1157NA and 1034NA are ANSI-standard types with natural amber glass, substituting a clear-glass equivalent in a position requiring amber output would alter the color of the emitted light, which carries regulatory implications for side marker compliance in North American markets.