Trouble codes

[quote:b06afb71d6="j7erry"]I have a 2003 Ford Explorer Sport, 85,268 miles and I have trouble codes P0171 Too Lean Bank 1 and P0174 Too Lean Bank 2. Guy at O'Reilly's said it was the upstream oxygen sensors. Wasted $125 because that didn't fix the problem. What can cause these codes and what can I do to fix it? It is 2wd with 4.0 l V-6. Thank you.[/quote:b06afb71d6]

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[quote:2f0e52ec94="j7erry"]I have a 2003 Ford Explorer Sport, 85,268 miles and I have trouble codes P0171 Too Lean Bank 1 and P0174 Too Lean Bank 2. Guy at O'Reilly's said it was the upstream oxygen sensors. Wasted $125 because that didn't fix the problem. What can cause these codes and what can I do to fix it? It is 2wd with 4.0 l V-6. Thank you.[/quote:2f0e52ec94]

I have a 1998 explorer sport w/4.0 V6 w/same problem changed mass air flow sensor and that fixed it.