Mini Cooper Clubman Turn Signal Bulb Size

Additional Notes

• The P21W is the most frequently specified bulb across these turn signal positions. It follows the ECE standard used in Europe and worldwide markets, operates at 12V and 21W, uses a single filament, and seats into a BA15s bayonet base.
• The BA15s base on the P21W is a single-contact bayonet fitting. This distinguishes it from dual-contact bayonet bases and means it is not interchangeable with physically similar bulbs that carry a BA15d base.
• The rear turn signal position on the Mini Cooper Clubman uses the P21W across all listed years from 2016-2022, making it the consistent specification for that position throughout the entire data set.
• The front turn signal position shows variation across years. The 12174NA is specified for 2016-2018 and 2021, the 12961 for 2022, and the P21W for 2023, indicating that the front position does not use a single standardized bulb across all listed years.
• The 12174NA is a natural amber glass variant, meaning the amber color is produced by the glass envelope itself rather than by a coated or painted surface. This affects direct substitution, as a clear bulb in the same socket would not replicate the same output color.
• The 12961 is a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W. At 5W, it draws significantly less power than the 21W P21W, and the two bulb types are not interchangeable due to differences in both base type and wattage.
• The front turn signal for the 2022 Mini Cooper Clubman uses the 12961, while the rear for the same year uses the P21W. The two positions require different bulb types in that model year and cannot share the same replacement part.
• The 2023 front turn signal specification shifts to the P21W, aligning it with the rear turn signal specification used across 2016-2022, though this does not indicate the socket or housing is the same between the two positions.