P0420 lexus code. How long can I drive with the engine light on

Question

P0420 has been reported. Oxygen sensor replaced but did not fix, only kept the light off for a few days.
Can I continue driving whilst the light is on?

Answer 1

The whole purpose of the CK ENG LT is to protect the catalytic convertor and inform the driver that the vehicle exceed emission, The catalytic protects the environment from harmful emission , How long you drive this vehicle, until the registration is due, With a failed emission the registration is on hold.