The compressor could not have cause the codes to come ON.
P0325:Knock sensor, is very common and that's probably the cause of the sluggish.
P1605:A/T Diag Comm Line, sometimes that problem is cause due to a low battery.
I suggest just erasing the codes and never come back to that shop for now. If the light comes back ON or the sluggish continues, you may consider replacing the knock sensor.
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