[electro]

Recently a question was asked:

I have a check engine light that sometimes FLASHES. What does it mean?

 

[Canuck623]

A flashing CEL is a problem (misfire usually) that has the ability to harm the catalytic converters. If the CEL flashes you need to get to a service shop and have it taken care of right away.

 

[phantom]

That you have a misfire happening at that time and could damage the cat converter.

 

[Boghog]

A flashing check engine lamp indicates that you have a misfire that's severe enough to damage the catalytic converter. To prevent damage to the catalyst, the car should not be driven until vehicle is repaired.

 

[electro]

There ya have it. A catalyst damaging event is presently occurring.
Lets mark this one RESOLVED!