Oxygen Sensor: Testing and Inspection

HO2S-1 INSPECTION
Inspect HO2S-1 and its circuit referring to "DTC P0151/P0132 Diag. Flow Table". If malfunction is found, replace.

HO2S-1 AND -2 INSPECTION
1. Disconnect HO2S-1 or -2 coupler.




2. Using ohmmeter, measure resistance between terminals "B" 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.