I have been trying to figure this out for awhile now and am lost its a pride thing now lol so i have reset these codes and replaced the sensor 3 times and still they pop up any ideas what is causing them? This is on an 2008 HHR SS
[] P0135 - HO2S Heater Performance Bank 1 Sensor 1 (Immature)
[] P2251 - O2 Sensor Reference Ground Circuit/Open Bank 1 Sensor 1 (SES) (History) (Immature)
[] P0130 - HO2S Circuit Closed Loop (CL) Performance Bank 1 Sensor 1 (SES) (Old) (History) (Current) (Immature)
[] P0130 - HO2S Circuit Closed Loop (CL) Performance Bank 1 Sensor 1
[] P2251 - O2 Sensor Reference Ground Circuit/Open Bank 1 Sensor 1