DTC U0401 Ford
O2 Sensor Positive Current Control Circuit High Bank 1 Sensor 1
O2 Sensor Positive Current Control Circuit High Bank 1 Sensor 1
Description
Engine started, battery voltage must be at least 11.5v, all electrical components must be off, parking brake must be engaged (to keep daytime driving lights off), automatic transmission selector must be in park. The ECM detected an unexpected voltage cond
Cause and Solution
Oxygen sensor (before catalytic converter) is faultyOxygen sensor heater (before catalytic converter) is faultyOxygen sensor heater (before catalytic converter) is faultyOxygen sensor heater (behind catalytic converter) is faultyO2S circ
Video Guide
Diagnostic Info
- DTC Code: U0401
- Brand: Ford