Good morning,
Clearing a code does nothing. It indicates there is a fault and the fault must be diagnosed, repaired and then the code can be cleared.
A 00 is a general code that indicates there is another fault stored. Did he tell you the other code? Also, there is no test for the catalytic converter. That is a separate issue and has nothing to do with your transmission. Sounds like this guy does not know what he is doing.
Roy
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Monday, July 15th, 2019 AT 3:20 AM