I have recently replaced the head gaskets and installed the Timesert inserts and I am coming up with all O2 sensors as well as the G0109. I located and attatched the ground and the car would not start. I took off the ground and it starts and runs fine yet I still get the SES and O2 codes. Can someone help? I just need to clear this issue up to smog and tab it. I have also checked for air leaks and there are none. Thank you very much for any help.