02Infinitii35

My V Control rod is working correctly, Each time I clear the codes, it throws the P1800 immediately with out driving the car. This doesn't cause the CEL light, but the P1147 does, at first it was accompanied by a P0139 that went away leaving the p1800 and p1147, The 1147 being the main issue because I need my car smogged. I have had a mechanic test my 02 sensors and assured me they were fine. My car doesn't show any signs of a bad 02 sensor. I seen somewhere that changing the air filter would help. I did that, but it only caused the P0139 to disappear. Any ideas?