2009 chev silverado 1500 4x4 5.3l eng P0172

Question

2009 silverado 1500 p0172 runs fine, been running in deep snow 4wd extensively. problem?

Answer 1

P0172 Fuel trim system rich bank 1

Running rich is usually a engine mechanical problem, Some of the causes for running rich is more fuel than air ratio, inspect the air filter and replace is needed, a vacuum hose that is disconnected that is affecting the operation of the MAP (manifold absolute pressure) sensor,the 02 sensor on bank 1 that may have shorted to the exhaust on bank1 ( bank 1 is where cylinder number 1 is located at) and this includes both the upstream 02 sensor ,and the downstream 02 sensor.(upstream 02 sensors are engine management sesnor downstream are catalytic monitor sensor)