Replaced catalytic converters,check engine light went away,but on again?

Some *aftermarket* cats are incompatible .. IF code PO420 is present - it is possible the downstream 02 sensor has failed. This requires *hands-on* testing by 'qualified personnel' ..!

What state are you in? Some states have longer warranties for your vehicle and could be / have been covered by General Motors. Also, a P0420 indicates ineffective catalyst, and your vehicle may have more than one, so see what has been replaced. An oxygen sensor being failed does not usually result in a P0420 code.

I have a 2013 6speed manual cruze, p0420 came on with the check engine light and I found a recall for the issue, got it reprogrammed free of charge. The check light went off for about a week and came back on recently. Sounds like o2 sensors, I also have a bad negative battery cable (I think) replaced the battery last month and there's corrosion on the new battery now. Also the car has had some miscommunication with the ignition/starter. The car just passed 90k miles and it clearly isn't safe to continue driving daily. The dealership service guy won't return my phone calls, I'm starting to hope I can get something out of this poor service or neglect. Like what if something happens to me while I'm driving. Might not buy chevy anymore, I understand car problems are common but in my opinion they haven't taken care of me. Let me know if there's any resolved Chevy Cruze's out there.