Auto Systems and Repair: P0152 - OBD-II Trouble Code

OBD II Fault Code

  • OBD II P0152

Fault Code Definition
The purpose of code P0152 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. P0152 is set when there is a sustained high voltage signal from the Oxygen Sensor for a specified amount of time.

Symptoms

  • Check Engine Light will illuminate
  • In many cases, no abnormal symptoms may be noticed
  • In many cases, the emissions will be elevated

Common Problems That Trigger the P0152 Code

  • Defective Oxygen Sensor
  • Faulty Oxygen Sensor wiring or connections
  • Shorted Oxygen Sensor Heater element(s)

Common Misdiagnoses

  • Oxygen Sensor is replaced when the problem is faulty Oxygen Sensor wiring or connections
  • Oxygen Sensor is replaced when the problem is an over-reporting Mass Air Flow Sensor