ZacharyH

No the sensors are OEM

Yes it's been doing that for a while now

Sorry for the late response but I tried to swap the upstream O2 sensors and the and the problem is still there but did seem to take 2 days before I got the check engine light that's why I haven't responded yet still have p219a

I have a 2013 GMC Sierra with a 5.3L V8 I have a P219A code I know it can be the O2 sensors, the fuel injector, or a vac leak but i'm not a rich person so I can't just buy all the parts just because so i'm hoping someone can help me pin down the most likely part to go for. Problems: MIL P219A Little hiccups here and there Lost of fuel MPG use to average ~ 17-19 MPG now ~ 10-13 MPG HWY Fixes so far: Ran fuel system cleaner Cleaned MAF sensor New filters Tried different fuel types OBD2 Freeze Frame Data: Parameter Description Results DTC that caused required freeze frame data storage P219A Fuel Sys 1 CL Fuel Sys 2 CL Calc Load 66.3 % ECT 190 °F STFT B1 -2.3 % LTFT B1 -0.8 % STFT B2 4.7 % LTFT B2 -1.6 % Fuel Pres 44 psi MAP 22 inHg Eng RPM 2037 Veh Speed 80 mph Spark Adv 37.0 ° IAT 48 °F MAF 6.23 lb/min TPS 39.2 % O2S B1 S1 0.69 V STFT B1 S1 -2.3 % O2S B1 S2 0.66 V STFT B1 S2 99.2 % O2S B2 S1 0.08 V STFT B2 S1 4.7 % O2S B2 S2 0.66 V STFT B2 S2 99.2 % Run Time 290 sec Command EVAP 100.0 % Fuel Level 78.0 % Warm-up DTC Clr 1 Clr Dist 11 miles EVAP_VP -3.6 InH2O BARO 25 inHg CAT Te 11 1562 °F CAT Te 21 1562 °F ECU Volts 14.32 V LOAD Value 43.9 % EQ Ratio 1.00 Rel TPS 25.1 % Ambient 45 °F TPS B 38.8 % ACC Pedal D 19.2 % ACC Pedal E 9.4 % Command TAC 35.7 % FUEL_TYP NONE ALCH_PCT 11.0 % Any help would be great.