B4000 2WD V6-4.0L OHV (1994)
Oxygen Sensor: Testing and Inspection
Service Tips
Service Tip
HEATED OXYGEN SENSOR
RIGHT HAND and LEFT HAND (HO2S RH and LH)
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If the Heated Oxygen Sensor or circuit has an open or short the following Diagnostic Trouble Codes (DTC)s are output.
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RH Sensor DTC No. 144, 172 or 173 is output.
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LH Sensor DTC No. 136, 137, 139, 176 or 177 is output.
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If the Heated Oxygen Sensor circuit fails, poor fuel economy may occur.
