P013B code


The OBD-II generated error codes help you to identify the possible errors in your vehicle. If any error code is generated in your vehicle, it is necessary to understand the reasons, symptoms, and seriousness of the error code. And, it is also mandatory to take your vehicle to the mechanic and rectify the errors. Before attempting any process to rectify the error it is necessary to know the meaning of the error code P013B.

Definition of the P013B error code

The technical definition of the PO113B error code is Oxygen Sensor Slow Response – Lean to Rich (Bank 1, Sensor 2). It can be elaborated as a powertrain control module (PCM) detects that oxygen sensor 2 in bank 1 of the engine is taking longer than expected to switch from rich to lean.

Meaning of the P013B error code

Automotive oxygen sensors are constructed using zirconium dioxide sensing elements, and these are protected by specially designed vented steel housing. Platinum electrodes attach the sensing element to the wire leads in the Oxygen sensor wiring harness that is attached to the PCM through the controller area network. Electrical signals are supplied to the PCM in respective of oxygen particle in the engine exhaust to the oxygen particles in the ambient air

The generated exhaust gases are pushed into the exhaust manifold where they can flow through upstream Oxygen sensors. These gases flow through the oxygen sensors vent holes and the ambient air is drawn through the wire leads cavities and trapped in the small chamber of the sensor. The trapped air is heated using exhaust and forces the oxygen ions to produce the voltage.


If the oxygen sensors fail to cycle regularly over a set time frame the, P013B code is generated, and the check engine light is illuminated.

The possible reason for the P013B error code

There are several reasons for the P013B error code, some of them are:

  • Defaults in oxygen sensors
  • Burnt, broken, or damaged connectors
  • Defects in catalytic convertor
  • Leakage in exhaust engine
  • Problem in wirings
  • Engine running in too rich or too lean mode

Possible symptoms of P013B error code

There are different symptoms in your vehicle if your vehicle is triggered with P013B error code:

  • Check engine light illuminates
  • Performance of engine lowers
  • Failed fuel economy
  • Other DTCs may be generated

How to diagnose the P013B error code?

To diagnose the P013B error code, you should take your vehicle to the garage, and then mechanics will scan the error code using the scanner and scan all other stored error codes. They will reset the error code and will take a small test drive to check if the code returns.

If the code returns, they will visually inspect the wiring or the harness for damages or corrosion. If any error is diagnosed in the wires or the harness they should be repaired or replaced.


After the connection of the wires to its proper routes, if code return, then the DVOM test is performed that leads to sensor ground and signal wires to examine the live informative data from oxygen sensors.

If the code returns again, then check the oxygen sensors. If needed repair or replace it.

How to fix the error code?

There is not any single solution to fix the P013B error code, but you can follow these steps to rectify the generated error code:

  • Replacement of oxygen sensor
  • Replacements of faulty wiring and connectors
  • Replace/reset the faulty PCM

If your vehicle is diagnosed with a P013B error code, it is advisable to take your vehicle to the garage and take the proper steps to rectify the error.

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