Service Engine Soon Light

[hbbz686]

In December my SEL light came on and then in March started getting a rough idle. In April my Expedition actually died at an idle. I have replaced all 4 O2 sensors, MAF Sensor, EGR Valve and EGR Solenoid, tested the EGR Sensor it shows to be good. I have also had the fuel pump replaced and have again replaced the fuel filter. Have also cleaned out the EGR ports. Now there is no rough idle and it does not die but I cannot get the SEL light to go out.

 

[AZexpy]

Why don't you have auto zone or a place like that scanned for u. Since you had all those parts replace might only need to be reset

Sent from my VS980 4G using Tapatalk

 

[bedrck46]

you could also disconnect the battery for about 20 minutes and see if the light goes off

 

[hbbz686]

I have reset it, and it comes back on. Still the same codes.

 

[bedrck46]

post the codes that are coming up. That should always be something to post when asking for help.

 

[hbbz686]

P0171 and P0174

 

[bedrck46]

P0171 - System Too Lean (Bank 1)
P0174 - System Too Lean (Bank 2)

Fuel System.
Fuel pressure regulator (leaking, faulty).
Fuel filter plugged, dirty.
Fuel pump (weak, check valve leaking).
Leaking/contaminated fuel injectors.
Low fuel pressure or running out of fuel.
EVAP canister purge valve leaking (when the canister is clean).
Fuel supply line restricted.
Fuel rail pressure sensor (incorrect reading).
Air Induction System.
Air leaks after the MAF.
Vacuum Leaks.
PCV system (leak or valve stuck open).
Improperly seated engine oil dipstick.
Exhaust System.
Exhaust leaks before or near the HO2Ss (exhaust manifold gasket, mating gaskets).
EGR system.
Vacuum hose disconnected on EGR System Module (ESM) applications.
EGR valve tube/gasket leak.
EVR solenoid vacuum leak.
Secondary Air Injection.
Damaged/malfunctioning secondary air injection system (mechanically stuck valve).
Air Measurement System.
MAF sensor (contaminated, damaged, or faulty).

 

[hbbz686]

Fuel Pump was replaced in 2013
Fuel Filter has been changed
Cold Air Intake has been cleaned and have replaced the sensor
No air leaks or vacuum leaks
MAF sensor change 2014

Will have to look into a few of the other things, thank you!!!