Heated Oxygen Sensor (Sensor 1) Inspection

Check that HO2S-1 signal voltage referring to Step 2 and 3 of DTC P0131 / P0132: O2 SENSOR (BANK 1 SENSOR - 1) CIRCUIT LOW VOLTAGE / HIGH VOLTAGE and/or DTC P0151 / P0152: O2 SENSOR (BANK 2 SENSOR-1) CIRCUIT LOW VOLTAGE / HIGH VOLTAGE . If signal voltage does not vary as specified, repair or replace.