What should i replace on a 2009 lacrosse with codes p1125 and p2138

Question

2009 buick lacrosse codes p1125 p2138 and po455

Answer 1

P1125 Accelerator pedal position (APP) system

P2183 Accelerator pedal position (APP) sensor 1-2 correlation

P0455 Evaporative system large leak

For P0455 make sure the gas cap is fully secured, As for P2138 there is a TSB which you need to inspect for first, This is about water intrusion into the instrumant panel harness connector which carries APP signal to the ECM. TSB 07-06-04019D