Ready to give up; got codes
Ready to give up, engine will crank but won't start:
A friend came by an has a thing to plug in an check the codes. He ran the codes an 2 came up that's said confirmed. Something to do with the catalyst system bank 1 and bank2??
The numbers are po420 & po430. An both said confirmed at the end. I don't know what any of that is or how to go about fixin it. It's orobly somethin outrageously expensive. Can someone please give me some advise? May help me so I no the mechanic isn't bending me over an milk in me for every penny he can?!