Send power to the ignition, accessory and starter circuits each time the key is turned with the Standard Ignition Ignition Starter Switch US-257, built with copper alloy conductors and tested for both mechanical and electrical switching performance. It is listed for several models, among them the 1995-2005 Chevrolet Cavalier, 1995-2005 Pontiac Sunfire and 1994-1998 Buick Skylark. It is a direct-fit replacement for the listed applications; see the Buyer's Guide tab for the full list.
Standard is a global manufacturer of original equipment ignition products and keeps complete quality control through the whole manufacturing process, from componentry to the finished product.
Signs this part may need replacing: the engine does not crank when the key is turned to start, the engine stalls or loses electrical power intermittently, or accessories and dash lights cut out in certain key positions. If a failed ignition switch is the cause, this part replaces it. Diagnose the circuit before replacing.
Interchange: 2-IS110
2IS110 · CS199 · IS110 · LS643 · KS6543 · 26034119 · KS6543SB · US257T
This part cross-references / interchanges with the following part numbers:
Is this the right 1995-2005 Pontiac Sunfire switch?
The US-257 is listed for the 1995-2005 Pontiac Sunfire and the 1995-2005 Chevrolet Cavalier. Check the Buyer's Guide tab to confirm your exact vehicle.
Can I use this as a 1994-1998 Buick Skylark switch?
Yes. It is listed for the 1994-1998 Buick Skylark as a direct-fit replacement. The Buyer's Guide tab shows every listed application.
What does an ignition starter switch do?
It routes battery power to the ignition, accessory and starter circuits based on the key position. This is how the engine is cranked, and how the vehicle's electrical systems are powered.
How is the US-257 built and tested?
It uses copper alloy conductors for strong conductivity with low resistive losses. Every switch is 100% tested to verify both its mechanical and its electrical switching performance.
What are signs an ignition switch may be failing?
Common signs include no crank when the key is turned to start, intermittent stalling or loss of power, and accessories cutting out in certain key positions. Diagnose the circuit before replacing the switch.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
