Code problems 99 sport

[rextar99]

hey guys i just joined here a few weeks ago and have a little problem.. i have a 99 explorer sport with the 4.0 OHC v6. the check engine light came on and when i ran the codes it said system too lean bank one AND two... and ideas on what it might be?

 

[lwrdxsport]

Check all of you vacuum lines, and also clean the mas airflow sensor with some contact cleaner. Thats what happened to mine and it had a dirty sensor and a loose vacuum line. If you have an aftermarket intake and airfilter that you just cleaned or just installed you didnt give the oil on the filter enough time to dry and the oil made the sensor faulty.

Happy Exploring