The Lexus ES350 side marker requires a 194 bulb size for the lighting components located on the exterior of the vehicle. Data for the specific bulb requirements covers the range from 2021 to 2024.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 168 bulb is an ANSI-standard miniature wedge type in the T10 form factor, rated at 12V and 4.9W, and it serves as the front side marker across the Lexus ES350 from 2007 through 2018, with the 2019 and 2020 model years carrying the same size specifically on trims equipped with LED headlamps.
The 12961 is a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W. It replaces the 168 as the front side marker bulb on the Lexus ES350 for the 2021-2023 model years.
Both the 168 and the 12961 share the T10 wedge form factor, meaning they are physically similar in shape. However, the 12961 carries a slightly higher wattage rating of 5W compared to the 168 at 4.9W, and the two are catalogued under different part numbering systems, one ANSI and one Philips proprietary.
The W2.1x9.5d base designation on the 12961 is the IEC standard description for the common T10 wedge base, where 2.1 refers to the wedge width in millimeters and 9.5 refers to the pin length in millimeters. This base type is widely used in low-wattage automotive marker and interior lighting applications.
For the 2019 and 2020 ES350, the front side marker bulb size of 168 is conditional, applying only to vehicles equipped with LED headlamps. This indicates that trim or package level affects the correct front side marker bulb specification for those two model years.
The rear side marker position on the Lexus ES350 is specified only for the 2007-2012 model years, with the 168 bulb listed across all six of those years.
Because the 168 and 12961 share the same T10 wedge base, physical fitment in the socket may be possible across both bulb types. However, they are catalogued separately by model year in these specifications, and substitution between them is not indicated as interchangeable within this data.