P0151 - OBD-II Trouble Code

Auto Systems and Repair

Oxygen Sensor Circuit Malfunction (Bank 2, Sensor 1)

Our emissions expert has put together the following information about the P0150 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.

OBD II Fault Code

  • OBD II P0150

Fault Code Definition
The purpose of code P0150 is to track the amount of time that the Oxygen Sensor or Air Fuel Ratio Sensor takes to go from indicating that the fuel control system is in open loop to rapidly switching above and below the 450-millivolt set point, thus indicating that the fuel control system is in closed loop. Code P0150 is set when there is not proper signal activity from the Oxygen Sensor within the specified time.

Symptoms

  • Check Engine Light will illuminate
  • In many cases, no abnormal symptoms may be noticed
  • In some cases, the vehicle will fail an Emissions Test
  • In many cases, the emissions will be elevated

Common Problems That Trigger the P0150 Code

  • Defective Oxygen Sensor
  • Faulty Oxygen Sensor wiring or connections
  • Defective operation of the Fuel System

Common Misdiagnoses

  • Oxygen Sensor Sensor is replaced when the problem is a lean-running fuel system
  • Oxygen Sensor is replaced when the problem is faulty Oxygen Sensor wiring or connections
  • Oxygen Sensor is replaced when the problem is a vacuum leak or defective Mass Air Flow Sensor
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