Honda Fit Dome Light Bulb Size

The Honda Fit dome light utilizes 168, 12961, and DE3175 bulb sizes depending on the specific version of the vehicle. Data for the bulb sizes covers the range from 2007 to 2020.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2019-2020	168
2015-2018	12961
2007-2012	DE3175

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175

Other Locations

Additional Notes

The Honda Fit dome light specifications reference three distinct bulb types across its model years: the 168, the 12961, and the DE3175.
The 168 and 12961 are both T10 miniature wedge bulbs operating at 12 volts, sharing the same physical form factor despite carrying different designation systems.
The 168 is an ANSI standard designation used in the US and Canada, rated at 12V and 4.9W, and it is specified for the 2019-2020 Honda Fit dome light.
The 12961 is a Philips part number for a T10 wedge bulb with a W2.1x9.5d base, rated at 12V and 5W, and it covers the 2015-2018 model years.
The W2.1x9.5d base designation on the 12961 describes a wedge-type base where 2.1 refers to the wire contact width in millimeters and 9.5 refers to the insertion depth in millimeters.
Although the 168 and 12961 share the T10 form factor, the 0.1W difference in rated wattage and their separate designation systems indicate they are not formally interchangeable without confirming socket and base compatibility.
The DE3175 is an ANSI standard festoon bulb with a 31mm length and end-cap contacts, operating at 12V, and it is specified for the Honda Fit across the 2007-2012 model years.
Festoon bulbs such as the DE3175 differ fundamentally in construction from wedge bulbs, as they make electrical contact through metal caps at each end rather than through a wedge-shaped base, making them physically incompatible with T10 sockets.
The shift from the DE3175 festoon type to the 12961 wedge type between the 2012 and 2015 model years reflects a change in dome light socket design across Honda Fit generations.
Substituting a festoon bulb for a wedge bulb or vice versa in the Honda Fit dome light would require a socket adapter, as the two contact types are not directly interchangeable.