AAP and AZ do this as a free service. They plug the scanner in and read the codes. Try to get them to give you the exact codes numbers. These will be in the format of of PXXXX where XXXX is a 4 digit number for all 96 and newer cars.
As far as which one to go to, it's your choice.
Write down the exact code numbers (this is important, not just the descriptions of the codes) and post them here for analysis.
Do not purchase any parts from the store unless you are convinced that the parts store person knows what he/she is talking about. An ASE Certification badge is a good hint of what to look for.
The exhaust leak is not the cause of the CEL or any drivability problems.
Check BOTH cooling fans for operation with the AC on.
Steve
