PCodes and stalling

Question

im getting P codes p1400, P1131, P1151, P 0171 and P0174 i got a 2003 ford tarus its dying at a light or stops sighn unless i put in nutral and keep RPMs above 1

Answer 1

P1400 Differential Pressure Feedback electronic sensor circuit low voltage

P1131 Lack of upstream heated oxygen sensor switch sensor indicates lean Bank 1

P1151 Lack of upstream heated oxygen sensor switch  sensor indicates lean Bank 2

P0171 Fuel trim lean Bank 1

P0174 Fuel trim lean Bank 2

This condition that you have is a vacuum leak, vacuum leaks are air leaks that gets past the MAF sensor which are unaccounted for in return it sets a lean code condition, This is the reason the IAC (idle air control ) valve can not maintain a target idle,  Some of the cause can be the EGR valve stuck open , the PCV hose the PCV itself, or disconnected vacuum lines or plugs

​ Here is a typical MAF sensor if this boot is torn or any opening it causes the system to go lean, this is a area that should be looked into