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P0138 O2 Sensor Circuit High Voltage
Code is for the second O2 sensor and is typically an indication that
either the harness has become disconnected, or is wet; or the sensor
itself has failed.
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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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Trouble codes are normaly 4 digits with a "P" or "B" before it. I am gonna assume that you meant P0138 and P0401:
P0138 is Oxygen Sensor Circuit High Voltage (Bank 1, Sensor 2) P0401 is Exhaust Gas Recirculation Flow Insufficient Detected
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)
Possible Solutions
Here are some potential solutions:
Replace O2 sensor
Repair short to battery voltage in o2 sensor signal circuit
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)
Symptoms: There may be no noticeable symptoms except for MIL illumination. Possible high fuel pressure can over rich the system.
Causes: 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
I hope this helps to solve it (remember to rate this answer).
The Heated Oxygen Sensor (1 or 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)
Symptoms: There may be no noticeable symptoms except for MIL illumination. Possible high fuel pressure can over rich the system.
Causes: 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
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)
Symptoms: There may be no noticeable symptoms except for MIL illumination. Possible high fuel pressure can over rich the system.
Causes: 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)
Possible Solutions: Here are some potential solutions: * Replace O2 sensor * Repair short to battery voltage in o2 sensor signal circuit
P0138 is a high voltage output on bank 1 sensor 2
(bank 1 is the same side as #1 clyinder, sensor 2 is after convertor) I
would check for a rich fuel/air mixture causing the cat to overload. Need replace it.
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