2001 Ford Escort Q&A
2001 Ford Escort Question: 0 voltage reading on both O2 sensors
Have 2001 Ford Escort 4 door sedan. The check engine light was on, hooked up car OBD II to laptop using Autotap program for reading codes and real-time sensor outputs. Both O2 sensors read 0 MV. Replaced both O2 sensors with new Bosch units and cleared fault codes with program. Both new O2 sensors still read 0 MV. Changed out front sensor with another new Bosch unit and both still read 0 voltage. Tried new computer and still no sensor voltage. Rang out harness wiring and found no opens. Can't get car to complete emissions check without O2 sensor reading to pass state inspection. Car runs great - rotorhead
What codes are coming up? - DaveJHM
check the voltage at the sensor for true voltage.Possible open circuit or fuse blown.the down stream sensor wiring can short on heat shield ive seen several do that.to check voltage ,use straight pins and push into the wires at about a 45 degre angle about an inch apart so they cant touch each other. when you are through you can remove the pins and rub the spot where they are inserted to seal the opening. - frwainscott
So far I have checked the voltage at the 02 sensor itself and it is not the same as what the live data view is showing me IE: .3 at the signal voltage and live data view is still showing 0.00. Thi...