hi all,i have a 2001 f-150 supercrew4x4.recently my service engine light came on,so i took it to auto zone to see what was wrong.they used the scan tool on it and it gave me these codes-P1151 lack of 02 switches-bank2 sensor 1 and P1131 lack of bank1 02 transistions-lean,explenation ECM detected bank 1 02 at its lean limit. could someone please help me with this,and what i need to do to fix this problem? any help would be greatly appreciated,also on the P1151 code it said ECM could not adjust fuel trim because of a lean or rich condition.

 

http://www.obd-codes.com/trouble_codes/ford/

 

You need to replace the upstream O2 sensor on the driver and passenger side. Do a search, they come up often.

 

ok thanks for the info.

 

No, he doesn't. He needs to check for vacuum leaks...probably in the PCV hose somewhere.