Question about Ford Taurus
Hi. This will be a short in the ground section of the connecting wiring harness. You will need to find and Repair the short or open circuit in the connecting harness that connects to the affected O2 sensors. There may be high resistance in wiring harness or harness connectors, in this case. The sensors are not the culprit, due to the fact that the sensors have been replaced, as stated in your post. This is merely a harness or connector issue. Worst case scenario will be a faulty PCM. This is highly unlikely, but if the harness connectors and wiring test out ok, replace the PCM.
A simple multimeter or volt meter can be used to test the wiring at the connectors for open circuit. repair the wring or replace it entirely. Start by pulling the connectors and visible inspect the contacts for corrosion; then use the meter to test for an open or shorted harness.
Posted on Jul 07, 2010
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Posted on Jan 02, 2017
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