had a 420 error code, went away now i have an odd wobble at low speed

What is your question?

noticed an engine check light. Hooked up a code reader, 420 was the code. This seems to have to do with the catalytic converter. The error has cleared [went away like magic???] but i have an odd wobble at low speeds. what is it???

What makes this problem better or worse?

NA

How long has your 2015 Nissan Rogue had this problem?

2 weeks