About 2 weeks ago I posted about a gross smell coming from the Trax. Thought it was bad gas. Well last night I got a p0420 code with no other symptoms. No drivability issues, no lack of power or idle issues... is it safe to say that one of the two cats is shot? I also heard it could be a cracked flex pipe which is common but it's the smell that came and went last week that is troubling me. Thanks!