My Check Engine Light came on yesterday and I got the P0171 and P0174 codes.

P0171 System too Lean (Bank 1) ) faulty air mass flow sensor

P0174 System too Lean (Bank 2) )

The car idles great, so I have ruled out any vacuum leaks, but I know the Oxygen Sensors are known to go bad (I have 70,000 miles on my '05). Just wondering if this is an Oxygen Sensor issue or a MAF sensor issue.