Component Inspection

1. Specification
   Fig 1: Measuring Resistance Between Terminals 2 And 4 Of Sensor Connector (Component Side)

   
   FRONT HO2S HEATER RESISTANCE REFERENCE CHART
   
   

   Temp. (°C)	Temp. (°F)	Front HO2S Heater Resistance (Ω)
   20	68	3~7

YES

1. Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

NO

1. Check HO2S for contamination, deterioration, or damage. Substitute with a known-good HO2S and check for proper operation. If the problem is corrected, replace HO2S and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.