service engine codes
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Joined: Sep 2003
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From: Columbia Mo.
service engine codes
2004 5.4 98,000 miles check engine light gives codes po71 lean bank 1,and po74 lean bank 2,changed both o2 sensers,and fuel filter light still coming on any ideas
Last edited by bholder; Sep 1, 2008 at 10:53 PM.
Senior Member
Joined: Apr 2008
Posts: 1,654
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From: Northern Alberta
im almost afraid to ask.....when was the last time you replaced the fuel filter?? lean bank 1 and 2 this is where i would be starting. also if its plugged bad enough to cause te engine to run lean be prepared for a fuel pump too.