this past week while driving to work in the morring the batterie light comes on then the van will shut off while driving. the alternator puts out at a cold start it jumps around 13-11v after it warms up it hold about 11.5v..also i replaced the up and down flow sensors but keep getting p171 code i allso get 1684 and 0622 code. and i dont know if this is related to thies codes but my fule gage is all wrong it will read
at 1/4 tank drop down to empty while driving but the next time i start it it will read a 1/4 tank agian and it realy dont matter how much fule is in thier it seems to read wrong if put half 3/4 or even full it keeps changing from when im driving in till the next time i start the van i have a read out that estimates how many miles till empty and that allso will read like 40 miles till empty and drop pretty fast but on the next start it goes back up any ideas? and i did just have the alt and battier replaced about 7 months ago