GoGators

Have a F150 4.2 V6 2004. 133,000 miles check engine soon light came on about a month ago. Had the machine hooked up and the man at the shop said I needed to change the gas filter. He reset it...the light went out.Fuel filter changed. The light came back on. Stopped in at Advance Auto and the man hooked up the hand held machine for free...it said Right Bank Running Lean.What needs to be done now? I am running some sea foam in the gas tank now. He said this should fix it. I have been running carb cleaner it for some time now.Is sea foam a fix all?Need help...thanks

GATORB8

Clean your MAF sensor and check for leaking vacuum and PCV lines.

GoGators

Where is the MAF sensor located and how do I clean it?

GATORB8

It's the Mass Air Flow sensor and will be in the air intake run between the filter box and throttle body.

http://www.ehow.com/how_4773694_mass...ensor-maf.html

Auburnfan400

Well i'm not sure if its different for a 2003 versus the newer trucks but when my truck did that, and said the same thing on the codes, it turned out to be a vaccum seal leak. Nothing expensive to fix. But as they've said, other things could cause that same code reading