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2001 Ford F-150 XL 4.2L Poor Fuel Economy, MIL Lamp on, lean codes 171,174
Posted to Ford Driveability on 1/21/2008 17 Replies

I get these 2 lean codes 171 and 174 every couple days and my gas mileage has gone way down. I have replaced fuel filter,air filter, checked with carb cleaner and propane for vacuum leaks, cleaned MAF with MAF aerosol cleaner. I have been told I need updated u...

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  Related Documents & Media  2001 Ford F-150 XL

 
Message Closed w/Summary

car Vehicle Data

2001 Ford F-150 XL

VIN 2FTZX17241
Engine4.2 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsPoor Fuel Economy, MIL Lamp on, Lean Codes 171,174
OccursAlways
Misc.Supercab

Trouble Codes

171lean bank one
174lean bank two
Message Closed w/Summary

car Vehicle Data

2001 Ford F-150 XL

VIN 2FTZX17241
Engine4.2 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsPoor Fuel Economy, MIL Lamp on, Lean Codes 171,174
OccursAlways
Misc.Supercab

Trouble Codes

171lean bank one
174lean bank two