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A HEGO sensor is a voltage generator that is in the exhaust system installed between the manifold and the catalytic converter. It is used to sense the amount of oxygen present in the exhaust gases. Two wire type, black wire is earth, grey wire is sensor signal. If four wire type black is earth, grey sensor signal, two white wires are for a heater circuit.
The wiring diagram shows the wiring color code, Power rating
and connector plug used. The wiring diagram explains the vehicle's electrical
connections with color code. It's a bit complicated to understand.
O2 Control (Bank 1 Sensor 1) Internal Resistance Too High
Oxygen sensor (before catalytic converter) is faulty.Oxygen sensor (behind catalytic converter) is faulty.Oxygen sensor heater (before catalytic converter) is faulty.Oxygen sensor heater (behind catalytic converter) is faulty.Circuit wiring has a short to power or ground.Engine Component Power Supply Relay is faulty .
E-box fuses for oxygen sensor are faulty .
Leaks present in the exhaust manifold or exhaust pipes.HO2S signal wire and ground wire crossed in connector .
HO2S element is fuel contaminated or has failed.ECM has failed .Here is what is listed.
DTC P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2) This code means that the heated circuit in the oxygen sensor on bank 1 decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0141. See also: P0135 (Bank 1, Sensor 1).
You will likely notice poor fuel economy the illumination of the Check Engine Light.
A code P0141 may mean that one or more of the following has happened: open or short to ground in the wiring harness O2 heater circuit wiring high resistance O2 heater element resistance is high Internal short or open in the heater element Note: Typically a failed catalytic converter does not cause this code. You're more likely to see a P0420 code for a failed converter.
Possible Solutions: Replace oxygen sensor (cannot repair open or short that occurs internally to sensor) Repair short or open or high resistance in wiring harness or harness connectors
DTC P0138 - O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor2) The Heated Oxygen Sensor (2) located rear of catalytic converter produces an output signal relative to oxygen storage capacity of catalytic converter. Ho2S 2 signal is less active than signal produced by front oxygen sensor. This code sets when HO2 Sensor voltage is greater than 999 mV for more than 2 minutes (time depends on model. Could be as high as 4 minutes)
There may be no noticeable symptoms except for MIL illumination. Possible high fuel pressure can over rich the system.
A code P0138 may mean that one or more of the following has happened: Faulty O2 sensor Short to battery voltage in O2 sensor signal circuit High fuel pressure (not as likely)
Here are some potential solutions: Replace O2 sensor Repair short to battery voltage in o2 sensor signal circuit.
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Well the 2 wires that are same color are the heater wires, and then for the other 2 colors, you will have to consult the manual that comes with the universal oxygen sensor. One will be a 5 volt constant from the computer, and the other will be the signal return. So you know which wires are what on the truck, I have the diagrams right here:
Ford Explorer is equipped with two oxygen sensor positioned on the exhaust manifold. Its necessary to replace the oxygen sensor at the first sign of failure. You can get all necessary details about o2 sensor at http://www.wholesalesensors.com/ford-oxygen-sensor/