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Hello , I will try my best to help you with your concern.
first a couple of questions
Have you had a recent work done to the vehicle?
Is the speedometer working?
Have you noticed anything about the way the vehicle is running or driving recently?
ok thanks for the info.
The p0420 code is indicating that the catalytic converter is not operating at prime efficiency
usually over time the catalytic converter will deteriorate causing this code. If this is the case you will have to replace the converter assembly.
the p0500 code is for a fault in the speed sensor circuit.
could possibly be related to the recent transmission work, but it might have been there before and just wasn't cleared.
the only way to know is to clear the codes and see what comes back.
the p0420 will always light up the check engine light, the p0500 might not
you can do that or go back to where you had them read and they can clear them. if the light comes back on, recheck what codes came back