Vehicle: 1997 Ford Truck Ranger, 2WD, V6-3.0L, VIN U, Automatic Transmission/Transaxle
Problem: Truck had DTCs P0135, P0141 & P0155. The vehicle ran well but the customer’s concerns were the MIL was on and there had been a noticeable drop in fuel economy.
Details: The tech found no power to O2 sensor heaters. Checked relay and fuse – both were good.
Confirmed Repair: The tech inspected the underside of the fuse box and found that the connections had spread open where the fuse is installed. He repaired the connections and tested for power to the O2 sensor heaters. Battery voltage is now present to both O2 sensor heaters. The DTCs were cleared and the tech performed a drive cycle. No DTCs returned. The problem was resolved.