F 150 4WD V8-5.4L Flex Fuel (2008)
All engines
12. NOTE: A special tool is available for use in removing the catalyst monitor sensors. An open-end wrench can be used for ease of removal.
NOTE: If necessary, lubricate the HO2S with penetrating and lock lubricant to assist in removal.
Remove the 2 catalyst monitor sensors.
13. Remove the exhaust Y-pipe-dual catalytic converter hanger bracket and isolator bolts.
14. Remove the RH catalytic converter.
15. Remove the LH catalytic converter.
Installation
NOTE: Clean the mating surfaces of the manifold outlet flare and the catalytic converter inlet flare.
All engines
1. Position the RH catalytic converter.
4.6L and 5.4L engines
2. NOTE: Make sure to apply anti-seize lubricant to the threads of the sensors before installation.
NOTE: A special tool is available for use in installing the HO2S. An open-end wrench can be used for ease of installation.
Install the RH HO2S sensors.
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Tighten to 40 Nm (30 lb-ft).
All engines
3. NOTE: Make sure to apply anti-seize lubricant to the threads of the sensors before installation.
NOTE: A special tool is available for use in installing the catalyst monitor sensor. An open-end wrench can be used for ease of installation.
Install the RH catalyst monitor.
^
Tighten to 40 Nm (30 lb-ft).
4. Loosely install the exhaust Y-pipe--dual catalytic converter hanger bracket and isolator and RH exhaust Y-pipe-dual catalytic converter hanger