Pontiac G5 front side marker bulbs use 168 size while rear side marker bulbs use 194 size. The replacement chart covers 2007 to 2009 vehicle production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Pontiac G5 uses two distinct bulb sizes across its side marker positions for the 2007-2009 model years: size 168 at the front and size 194 at the rear.
Both the 168 and 194 bulbs are classified as miniature wedge bulbs under the T10 form factor, meaning they share the same physical wedge-style base and general housing profile.
Despite sharing the T10 form factor, the 168 and 194 are not interchangeable in the Pontiac G5, as they operate at different wattages suited to their respective front and rear marker positions.
The 168 bulb, used in the front side marker position across all three model years, operates at 12V and draws 4.9W.
The 194 bulb, used in the rear side marker position across all three model years, operates at 12V and draws 3.78W, making it a lower-wattage unit than the front marker bulb.
Both bulb sizes conform to ANSI standards recognized in the United States and Canada, indicating standardized electrical and physical tolerances across manufacturers.
The wattage difference between the 168 (4.9W) and 194 (3.78W) reflects a deliberate distinction in output levels between the front and rear marker circuits of the G5.