hello , am having problems with the check engine light , the reading is p0171 + p0174 , I allready checked the intake leaks and replaced the air filter but still have the same problem , is it the o2 sensor ? how many has my car ? can anybody help me please? thank you.

 

Man I am having the same issue with my 2015 tahoe. Code read Catalytic. Dont know whats wrong. They say it may be my o2 sensor or wires. I am looking for help also. I hope it isnt the catalytic converter that I have to get replaced. Did you get your issue resolved?