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2004 Ford Explorer NBX 4.0L MIL Lamp on, P0174, p0171
Posted to Ford Driveability on 11/10/2016 21 Replies

Hello all, I am stumped on this one. Constantly sets long term fuel trim at +25 on both banks. It will come down 2 or 3 points at cruise speed but goes right back to +25 at idle. With the downstream O2 sensors replaced the degraded condition of both cats was r...

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  Related Documents & Media  2004 Ford Explorer NBX

 
Message Closed w/Summary

car Vehicle Data

2004 Ford Explorer NBX

VIN 1FMZU73K04
Engine4.0 L / 6 cyl / FLEX
Trans5-speed Automatic (Electronic)
DeliveryFuel Injection / SEFI
EmissionsOBD-II Compliant
SymptomsMIL Lamp on, P0174, P0171
OccursAlways
Misc.Full Time 4WD

Trouble Codes

P0171Fuel System Too Lean (Bank 1)
P0174Fuel System Too Lean (Bank 2)
Message Closed w/Summary

car Vehicle Data

2004 Ford Explorer NBX

VIN 1FMZU73K04
Engine4.0 L / 6 cyl / FLEX
Trans5-speed Automatic (Electronic)
DeliveryFuel Injection / SEFI
EmissionsOBD-II Compliant
SymptomsMIL Lamp on, P0174, P0171
OccursAlways
Misc.Full Time 4WD

Trouble Codes

P0171Fuel System Too Lean (Bank 1)
P0174Fuel System Too Lean (Bank 2)