1998 Jeep Wrangler Q&A

1998 Jeep Wrangler Question: 1998 wrangler code P0171 bank one lean jeep is getting 7 mpg black soot

replaced both 02 sensors, coolant sensor, no vac leaks defroster only, been to dealer twice no luck seems to be an emissions problem new cat. -
Answer 1
is the check engine light on? -
Comment 1
yes code reader P0171 vehicle is currently at local dealer for third time in two weeks to diagnosis -
Comment 2
What had to be done? Ive done the same things and have the exact same issues. -
Comment 3
no one can pin point the problem so I installed a battery switch and every time the check engine light comes on I flip the switch and reset the computer now I average about 15-16mpg the light comes on every 100 or so miles it can be a pain on long trips but to go from 7mpg to 15 it is worth the trouble -