2000 gmc 5.3 p0171 code repair help

Question

2000 gmc sierra 4x4 5.3L AIR Equipted

Answer 1

P0171 Fuel trim lean Bank 1

P0410 Secondary air injection system malfunction

The secondary air injection system uses a vacuum source for the secondary air injection solenoid.If this vacuum source was disconnected you can code a lean bank on the source of the vacuum leak and have a P0410. This is possible both are related to one condition vacuum hose disconnected or rupture at the air solenoid valve.