Having problems with your Ford Explorer Sport ?
My check engine light came on and machine gave me the codes p0171 and p0174 what do they mean? on a 99 ford explorer sport.
This means both banks have a lean condition. Most likely if you have a 4.0 SOHC motor your upper intake is sucking in air at the orings at the bottom of the intake. These are really bad about when they are cold in the morning the shrink and let air get by and after the engine warms up the orings soften and seal off.
Repair Help & Product Troubleshooting for Ford Explorer Sport
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