Catalytic Converter: Service and Repair

REMOVAL AND INSTALLATION

All vehicles
1. Prepare the vehicle for dual converter Y-pipe removal.
1 Raise and support the vehicle.
2 Remove the muffler and tail pipe assembly.

Vehicles with 4.6L and 5.4L engines





2. Note: On the 4.2L engine, the two upstream Heated Oxygen Sensors (H02S) are located on the exhaust manifolds and do not need to be removed.

Disconnect the H02S and the catalyst monitor sensor.

All vehicles





3. Disconnect the catalyst monitor sensor electrical connector.





4. Remove the nuts.

Vehicles equipped with transfer case skid plate





5. Remove the bolts, and the transfer case skid plate.

All vehicles





6. Remove the two bolts retaining the heat shield to the transmission support crossmember.
7. Using a suitable High-Lift jack, support the transmission.





8. Remove the nuts.





9. Remove the bolts, the nuts, and the transmission support crossmember.

Vehicles with 4.2L and 4.6L engines





10. Remove the nut.

Vehicles with 5.4L engine





11. Remove the bolt.

All vehicles





12. Remove the clamp.

13. Note: It may be necessary to heat the dual converter Y-pipe joint to ease removal.

Remove the dual converter Y-pipe.

14. To install, reverse the removal procedure.