code po171
PO171 = system adaptive fuel too lean (bank 1) PO174 = system adaptive fuel too lean (bank 2)
system to lean bank one 02 sensor ?
first try cleaning your mass air flow sensor.
po171--- system to lean (bank # 1)
2000 ford lightning. P1540,po171.po174
Trouble code P0171 means:System too lean (bank 1)
leaking intake gaskets...
P0171 System too Lean (Bank 1)
po343 is camshaft sensor 1 bad and po171 is bank1 sensor bad, in English po343 cam sensor is mounted on back of engine and hard to get to, the po171 is bank 1 o2 sensor easy to replace.
Fuel injection system, fuel trim to lean (bank 1)
i have check engine light on code po171 system to lean i changed o2 sensor check engine light came back soon after, i heard that it could be fuel air ratio sensor,where is it located on 6cyl Toyota sienna, do you have any input thanks tony