Mitsubishi Outlander PHEV Trunk Bulb Size

Additional Notes

• The Mitsubishi Outlander PHEV uses two distinct trunk bulb types across its model years: the 12961, a miniature wedge bulb, and the DE3175, a festoon-style bulb. These two types are not interchangeable due to their fundamentally different base designs.
• The 12961 is a T10 wedge bulb with a W2.1x9.5d base, rated at 12V and 5W. The wedge base relies on the bulb's glass envelope being gripped directly by the socket, with no separate metal base or end caps.
• The DE3175 is a festoon bulb with a 31mm length and end-cap contacts, also rated at 12V. Festoon bulbs make electrical contact through metal caps at each end of the glass tube, which is a different contact method from the wedge base of the 12961.
• The DE3175 carries an ANSI designation, meaning it conforms to a standardized specification recognized across the United States and Canada. The 12961, by contrast, is a Philips part number rather than an industry-wide standard designation.
• The 2024 Outlander PHEV uses the 12961 bulb for the trunk, while the 2018-2020 model years use the DE3175. This represents a change in socket type between those production periods, making cross-year substitution incompatible.
• The 2018 model year specification carries a production date qualifier of "From 11/1/2017," indicating the DE3175 fitment applies only to vehicles built on or after that date within the 2018 model year run.