Having problems with your 2000 Ford F150 Flareside SuperCab ?

Will a bad upsteam o2 sensor cause a po171 and po174 lean code????

Posted / edited by AnonymousUser on : 21-09-2020

Answers :

\015\012These are the faulste that would cause a code PO171 to come on
\015\012- Air leaking into the intake system
\015\012- Exhaust leaking
\015\012- Faulty MAF/VAF sensor
\015\012- Fuel pressure or pump and injector faults
\015\012- HO2 sensor
\015\012This is for the first bank of cylinders and injectors
\015\012The code PO174 is the same as above but for the second bank of cylinders and injectors.
\015\012So the best way to approach this is by process of elimination starting with the simpliest being exhaust and intake system leaks.
\015\012Check fuel pressures, then O2 sensor.
\015\012Hope this helps, let me know if you need further help
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