2001 Ford Explorer Q&A
2001 Ford Explorer Question: I was told that System too lean Bank 1 and System too lean Bank 2.
Codes Bank 1 po 171 Bank 2 Po 174 The "check engine" light came on so we had a 100,00 maintenance done on it. It ran for only 20 miles when the "check engine" light came on again. The shop gave us the codes but said that it was beyond their knowledge to be able to fix. - Lar_Arr2
From the Haynes manual: If both cylinder banks on a V engine are lean, the fuel pressure might be too low, there may be a vacuum leak, the ECT sensor could be skewed toward a higher temperature, or the MAF signal voltage could be skewed toward a lower voltage. - lightsaber