Ford Explorer Check Engine Bulb Size

The Ford Explorer check engine light requires bulb sizes 37 and PC194 for the instrument cluster display. Data for the specified components covers the time range from 1991 through 2001.

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
2001	PC194
1991-2000	37

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10) with printed circuit board twist-lock socket, for instrument clusters. 12V, 3.78W.	PC194
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 1W.	37

Other Locations

Additional Notes

The Ford Explorer check engine light uses two distinct bulb types across its model years: the 37 and the PC194, both of which are ANSI-standard miniature wedge bulbs rated for 12-volt automotive electrical systems.
The bulb 37 is a T5 miniature wedge type rated at 12V and 1W, and it fits the Ford Explorer check engine light for the 1991-2000 model years.
The PC194 is a T10 miniature wedge bulb rated at 12V and 3.78W, and it applies exclusively to the 2001 Ford Explorer check engine light.
The PC194 draws nearly four times the wattage of the 37 bulb, meaning the two types are not electrically equivalent and are not interchangeable.
A key physical distinction between the two bulbs is the socket type. The PC194 uses a printed circuit board twist-lock socket, which is a design specific to instrument cluster applications, while the 37 uses a standard miniature wedge base.
The T5 designation of the 37 bulb refers to a tubular glass envelope that is 5/8 of an inch in width, while the T10 designation of the PC194 refers to a wider envelope at 10/8 of an inch, making the two physically incompatible in the same socket.
Both bulb types conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and physical tolerances across manufacturers.