ODB II reader gives me PO171 &174 system too lean bank 1 bank 2. What can make both go at same time?

2001
ford
ranger
4.0L
84,000
4wd

Although there are numerous possibilities for these codes, I seem them quite often on Fords and it's almost always due to a severe vacuum leak. With the engine idling, listen for a hissing noise and try to follow it to it's source. Pay close attention to the rubber connectors for the PCV line and any other large feeds. They are notorious for sucking a hole right through the connector that only is visible with the engine running.




78 Corvette Pace Car For Sale-18k mi orig-Florida

You were correct, the rubber 90 that goes to what I think is the PCV was sucked and cracked. Could the Pcv be plugged and causing this? I went to the dealership and the parts guy said that what I explained has a re-heat on it 2 small and 1 large hose. Never seen a PCV like this before. What do you think.

It's just decomposed rubber. Replace it and you'll be fine




78 Corvette Pace Car For Sale-18k mi orig-Florida