A new customer brought in an auction-bought 2001, 3.0L Ranger 4X4, with 92,000 mi. His complaint was, 6 MPG on his first tank, and running poorly, also Ck eng light on. We scanned, there were 3, oxygen sensor codes, B1-S1, B2-S1, And B1-S2. All sensors were re... Login to read more.