Check engine light on codes 420, 453

Question

Codes p0420, p0453, are comming up, change out cataly. converter, No check engine light, did it help p0453

Answer 1

P0453 Fuel tank pressure sensor circuit high

No, this is separate, this code is for the EVAP system. Being circuit high this mean ECM does not see a connection, if this code does not return upon the second trip cycle it probable a intermittent code condition.