Mitsubishi Outlander PHEV Turn Signal Bulb Size

Additional Notes

• The Mitsubishi Outlander PHEV turn signal specifications reference three distinct bulb types across front and rear positions: PY21W, 12496, and 7440NA. All three operate at 12 volts, and both the PY21W and 7440NA are rated at 21 watts with single filaments.
• The PY21W follows the ECE standard used in Europe and worldwide markets. It uses a BAU15s bayonet base, which is an offset pin configuration designed to prevent incorrect installation of non-amber bulbs in amber-designated sockets.
• The 7440NA is an ANSI-standard T20 wedge bulb used in North American markets. Its amber color is produced by natural amber glass rather than a coating, which is the defining characteristic of the "NA" designation in its part number.
• The 12496 is a Philips/Osram part number for a halogen bulb in a specialty application. It is not an ANSI or ECE type designation, meaning cross-referencing to equivalent types requires consulting manufacturer compatibility data.
• For the front turn signal on the Mitsubishi Outlander PHEV, the 2018-2020 model years use the 12496 bulb, while the 2021-2022 model years use the PY21W. These two bulb types have different base configurations and are not interchangeable.
• For the rear turn signal, the 2018-2022 model years use the 7440NA, while the 2023-2024 model years use the PY21W. The wedge base of the 7440NA and the BAU15s bayonet base of the PY21W are physically incompatible with each other's sockets.
• A single model year can require two different bulb types depending on position. The 2022 Outlander PHEV, for example, uses the PY21W at the front and the 7440NA at the rear, making position-specific fitment a relevant factor when sourcing replacements.
• Although the PY21W and 7440NA share the same voltage and wattage ratings, their base types differ fundamentally. Substituting one for the other is not supported by the specifications, regardless of their matching electrical output.