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2005 Mercury Grand Marquis GS 4.6L MIL Lamp on
Posted to Ford Driveability on 9/30/2009 22 Replies

car runs great and the only complaint is the check engine light is on. only codes are po171 & po174 both lean codes. i installed a new fuel filter ( never been changed )scanned the o2 while driveing and they both seem to change rich to lean ( slow but i've see...

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  Related Documents & Media  2005 Mercury Grand Marquis GS

 
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car Vehicle Data

2005 Mercury Grand Marquis GS

VIN 2MEFM74W75
Engine4.6 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsMIL Lamp On

Trouble Codes

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

car Vehicle Data

2005 Mercury Grand Marquis GS

VIN 2MEFM74W75
Engine4.6 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsMIL Lamp On

Trouble Codes

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