Removal & Installation
5.4L & 6.8L Engines
- Disconnect the battery ground cable.
Disconnect the heated oxygen sensor (HO2S) electrical connector.
NOTEIf removing the HO2S on a 6.8L engine, raise and support the vehicle.
Using a HO2S socket tool 303-476, remove the HO2S.
NOTEIf necessary, lubricate the HO2S with penetrating and lock lubricant to aid in removal.
To install, reverse the removal procedure and note the following:
Tighten the HO2S sensor to 34 ft. lbs. (46 Nm).
NOTEApply a light coat of nickel anti-seize lubricant to the threads of the HO2S.
- Tighten the HO2S sensor to 34 ft. lbs. (46 Nm).
Checking the internal resistance of the HO2S sensor heater:
Turn the ignition switch off.