One problem related to catalytic convertor has been reported for the 2001 Honda Civic. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Honda Civic based on all problems reported for the 2001 Civic.
Took car in for valve adjustment (unusual to be needed until very high mileage), service tech found that exhaust manifold had a crack. Honda does not patch and the entire part to be replaced is over $800. 00. Parts person proceeded to tell me that this is very common in my model of car due to the design causing manifold to overheat and crack. If the problem is very common then it is a flaw in the vehicle yet there is no bulletin or recall. Not all models have this particular type of manifold and they stopped putting them in Hondas all together beginning 2005.