B4000 SE Cab Plus 2WD V6-4.0L OHV (1998)
Oxygen Sensor: Service and Repair
1. Raise and support the vehicle.
2. Disconnect the HO2S electrical connector.
3. Remove the heated oxygen sensors (HO2S) from the exhaust pipe.
If necessary, lubricate the heated oxygen sensors with Penetrating Lubricant to assist in removal.
4. Remove the heated oxygen sensors from the exhaust manifolds.
5. Follow the removal procedure in reverse order.
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Apply a light coat of Anti-Seize Compound to the threads of the heated oxygen sensors.