Ford 4L2Z-5E212-A
Catalytic Converter

The first step for servicing or repairing the dual three-way catalytic converter involves hoisting the vehicle in NEUTRAL position. You must disconnect the catalyst monitor sensor electrical connector before removing the muffler-to-converter flag nuts and bolts and springs along with discarding the flag nuts and bolts. First loosen nut connections on the left-hand (LH) converter-to-manifold section and the right-hand (RH) converter-to-manifold section. The dual converter Y-pipe to dual three-way converter nuts need removal before detaching the dual three-way converter from its isolator and taking out the catalytic converter. The engine needs repair that includes removal of both the gasket and the converter inlet gasket. The catalyst monitor sensor should also be taken out when needed. Start the exhaust component fastening process by tightening all components beginning from the last area of the vehicle. Before installing the sensor apply anti-seize lubricant to its threaded section while cleaning both the inlet pipe surfaces and catalytic converters for new gasket installation. Use new exhaust fasteners during assembly. Installation of the pipes requires an alternating technique to tighten the nuts based on specifications and the reverse order of removal for finishing the installation.

Service of the dual three-way catalytic converter begins by properly supporting and lifting the vehicle. First disconnect the catalyst monitor sensor before you remove all bolts along with their springs. First loosen both left-hand (LH) and right-hand (RH) nuts and then completely remove the nuts from the assembly. First detach the dual three-way converter from the isolator before complete removal together with the required gaskets and necessary disposal of the gaskets. The catalyst monitor sensor should be reinstalled after lubricating its threads with anti-seize material. Finish installation by tightening exhaust fasteners in the order starting with the vehicle's rear section then follow the opposite order of removal.