Hard to tell with the limited info you provide here.
What are the specific code numbers?
Forget the post catalytic converter O2/Lambda sensor code, has nothing to do with your current problem if this is in fact a correct code.
Does the car crank over, but not start?
If you have an intake camshaft sensor code, these are known problems, suggest you replace that sensor, then move forward after codes are cleared.
In the future, provide more details, it is hard do diagnose without a lot of detail.