The Volvo 240 front side marker bulb size measures 1034NA or 1157NA, while the rear side marker bulb size measures P21/5W. The replacement chart contains bulb size specifications across 1990 to 1993 vehicle production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Volvo 240 front side marker uses the 1034NA bulb for the 1990 and 1992-1993 model years, while the 1991 model year uses the 1157NA instead.
Both the 1034NA and 1157NA are ANSI-standard dual-filament bulbs rated at 12V with a 21W/5W output, sharing the BAY15d bayonet base.
The 1034NA is a variant of the 1157NA, with the key distinction being its natural amber glass envelope, which produces an amber output without the need for an amber lens or housing.
The 1157NA also features natural amber glass and the same BAY15d base, making it functionally similar to the 1034NA in terms of socket compatibility.
Because the 1034NA and 1157NA share the BAY15d bayonet base, the physical socket fitment is the same across all four front side marker model years on the Volvo 240.
The rear side marker on the Volvo 240 uses the P21/5W across all four model years from 1990-1993.
The P21/5W follows the ECE standard used in Europe and worldwide, whereas the front side marker bulbs follow the ANSI standard used in the US and Canada, reflecting a mixed regulatory specification within the same vehicle.
The P21/5W also carries a BAY15d bayonet base and a 12V, 21W/5W dual-filament rating, placing it in the same electrical class as the front side marker bulbs despite the differing standards.
Although the P21/5W and the 1034NA share the same base type and wattage rating, they are not the same bulb, as they conform to different standards and the 1034NA includes a natural amber glass coating absent from the P21/5W specification.