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Q:

P0420 and 0430 error codes on 1997 Mercury Cougar

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
The car seems to run fine, good power mileage, but need to pass Ohio echeck in july. When I clear the codes they reappear in 1-3 days
(2) Answers
(1) Comments
Clearing the diagnostic trouble codes does not necessarily means you solved the problems, learn more about these codes here; http://repairpal.com/obd-ii-code-p0420 and http://repairpal.com/obd-ii-code-p0430
With the same tool used to retrieve the codes and diagnose the problem. It is very likely that the engine light will go off again if the issue is not repaired.