code 172

pulled code 172 from car today
heated exhaust gas oxygen(HEGO) senseor voltage signal indicates lean (bank # 1)

is this a bad O2 sensor?

It is the first place to look, yes. Actually, the second. The first is to make sure the current sensor is plugged in all the way. That was my problem

Ira

thanks Ira for the reply, i have another issue im trying to clear up, it could also be triggering the code also, so i am gonna wait before to clear this other issue and see if it goes away...if not i have a spare 02 laying around.