babyhuey
Posts: 2759
Joined: 7/28/2005
Status: offline
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bkey71 right on with the flashing CEL. If the CEL is flashing it indicates a potential catalyst damaging missfire. The p0421 is often right behind as this is a CAT efficiency code. You should also have some kind of missfire code being stored along with the P0421 such as a P0300,P0301,P0302,P0303,P0304, P0305,P0306. Are any of these codes also being set? These are missfire codes and if the light is blinking at least one should have been stored as well. Would look first to the plug wires and spark plugs as potential source of the problem as is fairly common, especially on the 4 cyl engine given your description.
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RE: Emissions (engine) Light - 
