1.CHECK GROUND CONNECTION
 
 2.CHECK HO2S2 POWER SUPPLY CIRCUIT
 
 3.DETECT MALFUNCTIONING PART
 
 4.CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
 
 5.CHECK HEATED OXYGEN SENSOR 2 HEATER
 
 6.REPLACE HEATED OXYGEN SENSOR 2
 
 7.CHECK INTERMITTENT INCIDENT