Disconnect the negative battery cable for 10 seconds.
The check engine light on a Buick Regal can be reset with a special diagnostic scanner. This can be performed at a car dealership or service garage.
You can only reset it with an OBDII diagnostic scaner
The 2002 Buick Regal has a V6 engine.
The 2003 Buick Regal has a V6 engine.
The 2004 Buick Regal has a V6 engine.
The 2001 Buick Regal has a V6 engine.
The 2011 Buick Regal has an inline 4 engine.
The 2012 Buick Regal has an inline 4 engine.
The 2013 Buick Regal has an inline 4 engine.
The 2014 Buick Regal has an inline 4 engine.
Have vehicle scanned to determine the problem--most auto parts stores will scan free
The 2004 Buick Regal has a 3.8 L base engine size.