Having problems with your 2004 Ford F150 ?
Codes #171 & 174
\015 Have A 2004 Ford F150 Heritige 4.2 2wheel drive,auto, Check engine light is on ,showing code 171 &174 con you fix this problem.\015
\015\012first check out for o2 sensor if its faulty this can show up.but if its proper.Evaporative emission control system leak very small 171 System too lean (bank 1) 174 System too lean (bank 2)
Repair Help & Product Troubleshooting for 2004 Ford F150
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