Oxygen Sensor: Testing and Inspection

HEATED OXYGEN SENSOR (SENSOR 1) / (SENSOR 2)

INSPECTION
Inspect HO2S-1 and its circuit referring to "DTC P0131/P0132 or P0151/0152 Diag. Flow Table" in Computers/Testing/Trouble Code Diagnostic Procedures. If malfunction is found, replace.




HEATER INSPECTION
1. Disconnect HO2S-1 or -2 coupler.
2. Using ohmmeter, measure resistance between terminals "VB" and "GND" of HO2S coupler (1).
If found faulty, replace HO2S.

NOTE: Temperature of HO2S affects resistance value largely. Make sure that HO2S heater is at correct temperature.

Resistance of HO2S heater:
11.7- 14.3 ohm (at 20°C (68°F)) for HO2S-2
5.0 - 6.4 ohm (at 20°C (68°F)) for HO2S-1

3. Connect HO2S coupler securely.