The P0031 TOYOTA code will be detected when the ECM detects an excessively low voltage through the heated oxygen sensor heater circuit. The engine light or service engine soon warning light will be on when you start the car. Autel MaxiCOM MK808 is a good OBD2 all system diagnostic tool to help you detect the fault code and clear it quickly. Check how it fixes Toyota code p0031 Oxygen (air/fuel) sensor heater control circuit low Bank 1 sensor 1.
What is P0031 TOYOTA code meaning?
Air-Fuel Ratio (A/F) sensor needs to reach a minimum operating temperature of 1200 degrees F to produce an accurate voltage signal. The faster the air-fuel ratio sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).
In order to achieve the required temperature, a heater element is included inside the air-fuel ratio sensor. The ECM controls the air-fuel ratio sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.
The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.
Step-by-step guide to fix p0031 Toyota code by Autel MK808:
Connect MK808 to the OBD port of the vehicle via the main cable
Select Toyota
Acquire VIN info by tapping ‘Read’ (You also can enter VIN manually)
Confirm the vehicle info detect out
Then enter diagnosis menu
Go to Auto scan all systems incl. engine, air conditioner, gateway and so on
Select ‘Engine’
It says ‘This ECU controls the fuel injection, ignition timing, knock control, engine idle speed, self-diagnosis function and backup function in extraordinary circumstance etc.
Click ‘Trouble codes’
The fault code is P0031 Oxygen (air/fuel) sensor heater control circuit low (bank 1 sensor 1)
Click ‘Clear DTC’ to erase this fault code
Make sure the ignition is on and the engine off
Clear DTC successfully!
There is no trouble code detected now.
