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.
