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Get the P code read at your local parts chain store for free. It sounds like you need to find this out very soon. The code will tell you exactly what part is failing.
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You did not post the year make and model BUT you should not drive the vehicle because when the check engine light flashes, you can cause damage to your engine. You need to get an OBD reader from a chain autoparts store and see what codes are present.
the check engine light comes on if there is a problem with thecomputer system related to the emmision, when this is is repaired the light on can only be turned off with a monitor,code reader. some of these are quite inexpensive.over the web or at a part store.
Check your tail pipe for color. If insides are black you are running rich and it all may boil down to an oxygen sensor or an EGR valve. EGR valves are the most common causes for the 'check engine' light to come on. Your trouble codes will tell you what it is. Some auto stores will check it for free or you can buy an inexpensive checker.
What's the check engine light code? You need to get the code(s) read using a code reader and then we can help. A place like AutoZone will read the code for free and then you can look it up at http://www.obd-codes.com/trouble_codes/
PO420 is for catalyst system efficiency below threshold. I have seen this many times on vehicles from 96 up. It is due to the system not burning the fuel at what it considers an acceptable rate. Todays fuels are not the best we could have for internal combustion and sometimes it will set off the light. I tell my wife she is too easy on the car and it's not burning the fuel proper. After a couple days it goes out. It will not harm your engine and should go out again. Fuel system cleaning additive will also turn of light. Good luck and enjoy your Subbie. Greatest car ever Built.
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