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Ford Expedition error codes P0171 P0175 P0191

6 messages,  Last post on Apr 26, 2011 at 11:44 AM

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What is this discussion about? Ford Expedition, SUV

Messages Page 2 of 2

#5 of 6 Bank 1 and Bank 2 too lean error codes by bigdan71

Jul 24, 2010 (9:43 am)

Can someone please help me before I keep throwing my money away? My 98 Ford Expedition w/ 5.4L V8 has the check engine light on. I was told that it may be my Catalytic converters and others say that I need O2 sensors replaced. I replaced the O2 sensors with Bosch sensors but I still get the same codes. I was then told that I need the original sensors from Ford. Does anyone have a solution. The dealer wants 160 for the diagnostics plus parts and labor. Can a good mechanic guide me in the right direction? Thanks!

#6 of 6 Re: Bank 1 and Bank 2 too lean error codes [bigdan71] by coco43

Apr 26, 2011 (11:44 am)

Replying to: bigdan71 (Jul 24, 2010 9:43 am)
I have had the same code # and changed all o2 sensors massair flow sensor air filter and may more items. Come to find out on the back of the intake manifold and under the idle air valve there is a vacuum hose about 3/4 of an inch round that reduces to about 3/8 of an inch and goes around the back of the engine and to the pcv valve and back to the side of the intake. Mine was broke where it goes from 3/4 to 3/8 and sucking air like to never found it. If u need the ford part # it is f75z6c324ja that is on a 99 5.4 expedition. Hope this helps, let me know

Messages Page 2 of 2

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