B4000 2WD V6-4.0L OHV (1994)
Oxygen Sensor: Testing and Inspection
Component
HEATED OXYGEN SENSOR (HO2S)-(RH AND LH)
CAUTION:Use ONLY a high impedance Digital Volt Ohm Meter (DVOM) when testing components on computerized vehicles.
Be sure the voltmeter is set to read VOLTS only (not ohms). Be sure external voltage is not applied to the sensor lead, as damage to
the sensor may occur.