Two problems related to emission control have been reported for the 2004 Chevrolet Impala. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Chevrolet Impala based on all problems reported for the 2004 Impala.
Tranmisson, evap, evaporrative emission control system leaking.
Vehicle stalled out / stopped while traveling down the road. It has done it twice now. This car is fully equipped with cruise control and traction control. After the first time (three days ago) we took it to a dealer and they could not find any code (s) and or replicate it. It just happened again today. Both times the car started right up. This could be a disaster at high speeds on an interstate. Thank you. The consumer stated the vehicle stalled for a third time. The dealer ran it for codes and immediately, it came back as a problem with the mass air sensor. It was replaced and so far, there have been no more problems. Updated ivoq 08/01/12.