2004 PT cruiser turbo GT Problems

I have (my wife) a 2004 PT cruiser turbo GT. I have had so few issues with this baby since I bought it brand new. in the last year things have caught up. We started getting oil leaks and puffs of white smoke on start-up. so we took it to a guy I have known for 25 years. we fixrd all the oil leaks and did the 100,000 mile service and I changed the plugs and wires and Radiator all within the last 5 months. it runs so bad now It's disgusting. burns a quart of oil every 5 days ( no driveway stains) and it doesn't puff smoke every day. I now get 4 error codes 442, 456, 300, 522 . now I did replace my gas cap with a locking one because we live in Miami and people are stealing gas from cars after the hurricane but I'm not sure what I should do from this point on. any points, tips, or advice would be greatly appreciated