T100 Regular Cab Pickup 2WD L4-2693cc 2.7L DOHC MFI (1998)
Oxygen Sensor: Testing and Inspection
INSPECTION
INSPECT HEATER RESISTANCE OF HEATED OXYGEN SENSORS
(a) Disconnect the heated oxygen sensor connectors.
(b) Using an ohmmeter, measure the resistance between terminals +B and HT.
Resistance:
Bank 1 Sensor 1:11 - 16 ohms at 20°C (68°F)
Bank 1 Sensor 2:11 - 16 ohms at 20°C (68°F)
If resistance is not as specified, replace the heated oxygen sensors.
(c) Reconnect the heated oxygen sensor connectors.