The Land Rover Defender 90 turn signal utilizes a P21W bulb size for the lighting system. Data for the specified component covers the range from 1995 through 1997.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The P21W is a single-filament bulb operating at 12V and 21W, built to ECE standards for use in Europe and worldwide markets. It uses a BA15s bayonet base, which has a single locating pin on its collar.
The P21/5W is a dual-filament bulb with a BAY15d bayonet base, which uses two offset pins to ensure correct orientation during installation. It operates at 12V with a 21W main filament and a 5W secondary filament.
The BAY15d base of the P21/5W is not interchangeable with the BA15s base of the P21W, as the pin configurations differ between the two types.
Both bulb types conform to ECE regulations, a lighting standard recognized across Europe and numerous other markets worldwide.
The Land Rover Defender 90 front turn signal uses the P21/5W for the 1994-1995 model years, meaning the dual-filament bulb serves the front position across those two years.
The front turn signal specification changed to the single-filament P21W for the 1997 model year, representing a shift from a dual-filament to a single-filament application at that position.
The rear turn signal of the Defender 90 uses the P21W across all three listed model years, 1994, 1995, and 1997, making it the consistent rear fitment throughout that period.
Because the front and rear turn signals share the P21W in 1997, both positions on that model year use an identical bulb specification.
In 1994 and 1995, the front and rear turn signals require different bulb types, so substituting the rear P21W into the front socket would not be a correct fitment for those years.