1.CHECK GROUND CONNECTION
 
 2.RETIGHTEN A/F SENSOR 1
 
 3.CHECK EXHAUST GAS LEAK
 
 4.CHECK FOR INTAKE AIR LEAK
 
 5.CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
 
 6.CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
 
 7.DETECT MALFUNCTIONING PART
 
 8.CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
 
 9.CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER
 
 10.CHECK MASS AIR FLOW SENSOR
 
 11.CHECK PCV VALVE
 
 12.CHECK INTERMITTENT INCIDENT
 
 13.REPLACE AIR FUEL RATIO (A/F) SENSOR 1