The Volvo 740 front turn signal uses a 1157NA, 1034NA, or P21/5W bulb size, while the rear turn signal requires a P21W bulb size. The replacement chart covers 1985 to 1992 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The front turn signal positions on the Volvo 740 use dual-filament bulbs across all listed model years, while the rear turn signal positions use a single-filament bulb throughout the entire 1985-1992 production span covered by these specifications.
The P21W bulb, rated at 12V and 21W, is the sole rear turn signal bulb across all eight model years in the specifications. It follows the ECE standard and uses a BA15s single-contact bayonet base.
The front turn signal specifications show three distinct bulb types across the 1985-1992 range, indicating that the Volvo 740 underwent at least two front turn signal bulb changes during its production run.
The 1157NA and 1034NA bulbs are both ANSI-standard dual-filament types rated at 12V with a 21W/5W output and share the same BAY15d bayonet base. The 1034NA is documented as a variant of the 1157, which means the two types share a close technical relationship despite carrying different part designations.
The P21/5W bulb used in the 1985-1987 front turn signal positions follows the ECE standard rather than the ANSI standard used in later model years. It is also a dual-filament bulb with a BAY15d base rated at 12V and 21W/5W, making its electrical output equivalent to the 1157NA and 1034NA types.
Although the P21/5W and the 1157NA share the same BAY15d base and identical wattage ratings, one follows the ECE standard and the other the ANSI standard. These regulatory differences can affect physical tolerances and certification, so they are not listed as interchangeable in these specifications.
The front turn signal bulb for the 1988 Volvo 740 is the 1157NA, while the 1989-1991 model years use the 1034NA. The 1992 model year returns to the 1157NA, meaning the 1034NA was used exclusively during that three-year period for the front position.
The rear turn signal uses a BA15s single-contact base via the P21W bulb, while all front turn signal bulbs across every listed year use the BAY15d dual-contact base. These two base types are not interchangeable, as the BA15s has a single contact pin and the BAY15d has two offset pins to support dual-filament operation.
The natural amber glass designation on both the 1157NA and 1034NA bulbs indicates that the amber color is produced by the glass envelope itself rather than by an external lens or coating. This is a relevant fitment detail when the housing uses a clear lens rather than a colored one.
The P21/5W front turn signal bulbs used in the 1985-1987 Volvo 740 carry no amber glass designation in the specifications, unlike the ANSI-standard bulbs used in subsequent years. This distinction may be relevant when the application requires a specific method of producing the amber signal color.