Test TC-103B: 1/1 O2 Sensor Heater Failure

NOTE: This test applies to AB body only. Perform TEST TC-103A: 1/1 O2 SENSOR HEATER FAILURE before proceeding. For connector terminal identification, see CONNECTOR IDENTIFICATION . For component location and wiring diagram, see WIRING DIAGRAMS article.

NOTE: 1/1 Heated Oxygen Sensor (HO2S) is located in upstream position. On models equipped with 2 upstream HO2S, 1/1 HO2S is located in left upstream position.

NOTE: Allow HO2S to cool to room temperature before checking resistance.

Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIPS counter is not displayed or displayed count is not "0", condition required to set DTC is not present at this time. Erase DTCs and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES . If DTC SPECIFIC GOOD TRIPS counter is displayed and displayed count is "0", perform TEST NTC-11A: CHECKING OXYGEN SENSOR HEATER .