Suzuki Motorcycle DR-Z400 front and rear turn signal bulbs use a P21W size. The replacement chart covers 2000 to 2007 production years with bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Suzuki Motorcycle DR-Z400 uses the P21W bulb type across both its front and rear turn signal positions for all model years from 2000-2007.
The P21W is a single-filament bulb, meaning it serves one lighting function only, which is consistent with its dedicated use in turn signal applications rather than combined stop/tail positions.
P21W bulbs operate at 12 volts and 21 watts, a wattage rating that produces sufficient luminous output to meet signalling visibility requirements under ECE regulations.
The P21W carries an ECE standard classification, indicating it is recognized for road use across Europe and numerous other markets worldwide.
The BA15s bayonet base on the P21W features a single locating pin on the base collar, which distinguishes it from the dual-pin BA15d variant and makes the two types non-interchangeable despite their otherwise similar appearance.
Because the front and rear turn signal positions on the DR-Z400 share the same P21W specification, a single bulb type services both locations across the entire 2000-2007 production span.