have an 09 santa fe (3.3) check engine light came on. codes 171-174 came up [fuel system too lean banks 1 and 2]. any suggestions on what to check before i spend big bucks at the dealer? vehicle is 5 1/2 years old 46,600 miles. vehicle seems to be running ok. will this damage anything or affect gas mileage?

 

Check the rubber/plastic tube between the MAF and the throttle body for leaks.

 

Vacuum leaks
MAF sensor bad
O2 sensor bad
Weak fuel pump or pressure regulator bad
Clogged fuel filter
Fouled injectors

Just throwing ideas out there