The check engine light (service engine soon) comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to AutoZone or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area.
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.
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.
The 2004 Buick Regal has a 3.8 L base engine size.
The 2012 Buick Regal has a 2.4 L base engine size.
The 2001 Buick Regal has a 3.8 L base engine size.