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P0138 Fault-Error code 02 SENSOR CIRCUIT HIGH VOLTAGE BANK1 SENSOR2

Updated: Aug 26

What is P0138 Fault-Error code?


The P0138 Fault-Error code is an error code recorded by a vehicle's OBD-II (On-Board Diagnostics II) system. This error code is related to the oxygen sensor (O2 sensor) in the vehicle. Here's more information about error code P0138:


P0138

Meaning of P0138 Fault/Error code:


P0138 Fault/Error code is an error code defined as "O2 Sensor High Voltage (Bank 1, Sensor 2)". This indicates that a secondary oxygen sensor in the vehicle's exhaust system is signaling high voltage.



What Causes the P0138 Fault/Error code:


P0138 Fault/Error code usually occurs for the following reasons:

  • A broken or faulty oxygen sensor.

  • Missing or leaking exhaust systems.

  • Incorrect fuel air mixture.

  • Electrical connection or cable problems.


Symptoms of P0138 Fault/Error code:


P0138 Fault/Error code can generally cause symptoms such as worsening of the vehicle's fuel economy, decreased engine performance and increased exhaust emissions.



How to Determine P0138 Fault/Error code:


The P0138 Trouble/Error code is determined by accessing the vehicle's computer using an OBD-II scanner or reading device. These devices help you identify problems by reading the vehicle's error codes.


Errors Made While Fixing P0138 Fault/Error code:


Things to do when trying to fix the P0138 Fault/Error code may include:

  • O2 sensor replacement.

  • Checking the exhaust system and fixing leaks.

  • Solving problems with the fuel injection system or air intake.

  • Checking and correcting electrical connections or cables.



How Serious is the P0138 Fault/Error code:


The P0138 Trouble/Error code is considered a serious error code as it can affect your engine's performance and increase fuel consumption. It can also increase exhaust emissions, which can lead to negative effects on the environment.


P0138 Fault/Error code Solution What Repairs Can Be Fixed:


P0138 Fault/Error code may require different repairs depending on the reasons mentioned above. Often replacing the oxygen sensor and troubleshooting the exhaust system can fix this error.



Things to be evaluated regarding the P0138 Fault/Error code:


The following steps can be taken to analyze and fix the P0138 Fault/Error code:

  • Read the error code using an OBD-II scanner or reading device.

  • Check the oxygen sensor and replace if necessary.

  • Perform inspections on the exhaust system and fuel injection system.

  • Check electrical connections and cables.


P0138 Fault/Error code is an important part of vehicle maintenance and should not be ignored. If you receive this error, it is important to consult an auto repair professional and make the necessary repairs to resolve the problem.



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