Causes and Fixes P2279 Code: Intake Air System Leak

[@Reynoldzx]

Hey mate, I get the p2279 combined with p1119 code on my volvo VEA engine. Any Ideas what it could be?

[@simonflores3410]

How about po2099 on a 2015 gmc sierra 1500 5.3 the scanner saying system to rich my stft on bank 2 is -20 ltft is -15 I monitor the oxygen upstream sensor staying rich and downstream is flat line only switching to 500mv power and ground are ok