Mark LT 4WD V8-5.4L VIN 5 (2006)
Catalytic Converter: Service and Repair
Exhaust Y-Pipe-Dual Catalytic Converter
Material
Removal
All engines
CAUTION: Do not use oil or grease-based lubricants on isolators as they cause deterioration of rubber.
NOTE: The exhaust Y-pipe-dual catalytic converter is a 2-piece assembly. The RH and LH converters can be serviced separately as needed.
1. With the vehicle in NEUTRAL, position it on a hoist.
2. If equipped, remove the skid plate.
4.6L and 5.4L engines
3. Disconnect the LH heated oxygen sensor (HO2S) electrical connector.
All engines
4. Disconnect the catalyst monitor sensors electrical connectors.
5. NOTE: Whenever the exhaust Y-pipe - dual catalytic converter-to-exhaust intermediate pipe coupling is loosened, a new exhaust Y-pipe -dual
catalytic converter-to-exhaust intermediate pipe coupling must be installed.
Loosen the exhaust Y-pipe-dual catalytic converter-to-exhaust intermediate pipe coupling. Slide the coupling back onto the intermediate pipe.
6. Loosen the RH catalytic converter-to-LH catalytic converter clamp.
7. NOTE: 4.6L and 5.4L shown, 4.2L similar.
