Ford Expedition error codes P0171 P0175 P0191

mmachulsky

HELP.... at first I thought it Trans was going. had not get up and go just starting out or at high speed. Trans is fine. The mechanic had these error codes and said it may be the fuel pump driver module??? Has anyone experienced this or do you have any info on it. The part is a 2-3 week backorder. So i would think it has some problems...thanks everyone

boystruck

rsippos

Did you replace the module and all is well??? I have the same codes on my 05 expedition and it has 65000 miles. The dealer told me that the codes pointed to the fuel pump, but said that my module was corroded a bit as well. I am going to have them replace the module first and see what happens. I think that they want to milk me for money.

bigdan71

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!

coco43

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