2012 Chevy Sonic 1.6L 16V DOHC VVT

Daily driver, well loved for 3 years. New tyres. Took it to a mechanic, had her serviced and had timing issues sorted. She needs a new oil sump seal and oil cooler seal. Sump is brand new, reciepts are available but it was installed without a seal. Oil cooler unit and housing is new, reciepts are available, the previous mechanic that fixed the timing accidentally broke the internal oil cooler seal while trying to clean out the pipes. Head gasket is 100% with full vacuum. She also has a misfire due to the downstream 02 sensor that needs replacing. I can't afford it though. This car is a sports car and no longer suitable for my family. The license is up to date and papers are valid. No time wasters though please.