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Engine code p0138 - 2006 Mazda 3

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Code 138 is for a problem with the O2 sensor for bank one sensor two. Sensor two is after the catalytic converter. The computer is getting a high voltage reading from the sensor.
Usually the sensor is at fault, but it would need to be tested to verify before replacement.

Posted on Jul 12, 2013

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Posted on Jan 02, 2017

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Hi there i have 1997 Avalon V6 . the check engine light up # 138 and 401 so can you tell me the name of that two please thnks


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
for info on the P0401:
http://www.obd-codes.com/p0401

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I have a 2001 Dodge 2500 4wd,, gas engine,, codes p0138 and p0455 come up,,what do they mean. Thanks


P0455....Evaporative Emission Control System Leak Detected (gross leak)


P0138....O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)

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P0138 code


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

Hope helps (remember to rate and comment this).

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P0138 is code for o2 sensor Bank 1 Sensor 2. This sensor is the one behind the cat on the side of the engine that contains cylinder No 1.

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My check engine light is on and the default code is P0138


What kind of vehicle? I may have the book here.

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