The Pontiac Sunfire brake light utilizes unique bulb sizes 3157, 2458, and 3057 depending on the specific production period. Data for the light components covers the range from 1995 to 2005.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Pontiac Sunfire uses the 3157 bulb for brake lights across the 2000-2005 model years. This is a dual-filament T25 wedge bulb rated at 12V with a high-intensity filament of 27W and a low-intensity filament of 7W, governed by the ANSI standard applicable in the US and Canada.
The 3057 bulb serves the brake light position on the 1995-1999 Pontiac Sunfire. Like the 3157, it is a dual-filament T25 wedge bulb operating at 12V, 27W/7W under the same ANSI standard, though the two types are not confirmed interchangeable by these specifications.
Both the 3157 and 3057 share the same T25 wedge form factor and identical voltage and wattage ratings. Despite this similarity, they carry distinct ANSI designations, and substituting one for the other without verification of the specific socket and circuit design is not supported by the data provided.
The center high mount stop light (CHMSL) on the Sunfire draws from three different bulb types across its model range, reflecting a less uniform specification history than the main brake light position.
The 1141 bulb is the most frequently specified CHMSL bulb across the Sunfire range, appearing in the 1995-1996, 1998-1999, 2002-2003, and 2005 model years. It is a single-filament bulb with a BA15s bayonet base, rated at 12V and 21W under the ANSI standard.
The P21W bulb is specified for the CHMSL in the 2000-2001 and 2004 model years. It shares the BA15s bayonet base and the 12V, 21W electrical rating with the 1141, but it is governed by the ECE standard used in Europe and internationally rather than the ANSI standard.
Because the 1141 and P21W share the same BA15s base and identical voltage and wattage ratings, their physical and electrical profiles are closely matched. However, they originate from different standardization systems, and the specifications do not confirm them as direct substitutes.
The 912 bulb is specified solely for the 1997 model year CHMSL. It is a T15 wedge bulb rated at 12V and 12W, making it notably lower in wattage than the 1141 and P21W types used in surrounding model years. It is noted as a variant of the 921 bulb type.
The 912 wedge base is physically distinct from the BA15s bayonet base used by the 1141 and P21W, meaning the 1997 CHMSL socket is not compatible with the bulb types specified for other Sunfire model years in that position.
Across all CHMSL positions, the Sunfire specifications reflect the use of both ANSI and ECE standardized bulbs within the same model line, indicating that sourcing decisions varied by production year rather than following a single regional standard throughout the vehicle's production run.