In simple terms, your car has a misfire on cylinder 2 (P0302), and been driven like it more than a period in time. In turn has ruined the cat (P0420) by pouring unburnt fuel from the misfire into it.

Have never seen P1632 before. (edit - with that description)

Misfire could be plugs/leads or coil pack. Check plugs/check if spark from lead.

When the misfire is fixed, you'll still have the P0420 until the cat is replaced.

Is it an endura early 1300 ohv with silver/green rocker cover or rocam (duratec) black rocker cover ohc engine? What year?