2005 Lincoln Aviator Codes

[mrv568]

My 2005 Aviator had the check engine light come on last week. It ran fine no issues the code was P0171 I reset it. 9 days later it comes on again, this time 2 codes. P0171 and P0174 the vehicle runs fine. No rough idle, great power etc...
Any Ideas?

 

[matt0248]

I believe those are bank 1 and bank 2 lean codes. You can start by cleaning the MAF sensor with MAF cleaner, checking for any vacuum leaks or leaks in the hoses from the air filter to the throttle body