Toyota 25052-20190 No.2 Exhaust Manifold Converter Sub-Assembly

Disconnect the negative cable from the battery, then remove the exhaust manifold heat shield by detaching it from the exhaust manifold after removing the bolts, and spray penetrating oil on the exhaust manifold fasteners to allow it to soak in. Next, remove the heated oxygen sensors from the front and rear manifolds, followed by the EGR pipe from the rear exhaust manifold and cylinder head. Remove the nuts retaining the exhaust pipes to the front and rear exhaust manifolds, as well as the exhaust manifold braces from the block, including the support bracket and the two nuts at the exhaust pipe/manifold joint. Disconnect the electrical connector from the oxygen sensor at each manifold, then unbolt the exhaust manifolds from the cylinder heads and slip them off the mounting studs, noting that the rear exhaust manifold bolts are difficult to access and may require a long, flexible extension on your ratchet. Carefully inspect the manifolds and fasteners for cracks and damage, and use a scraper to remove all traces of old gasket material and carbon deposits from the mating surfaces of the manifolds and cylinder head. If the gasket was leaking, check the manifolds for warpage on the cylinder head mounting surface by placing a straightedge over the surface and trying to insert a feeler gauge; if the clearance exceeds the limit, have the manifold resurfaced at an automotive machine shop. Position new gaskets over the cylinder head studs, install the manifolds, and thread the mounting nuts into place, tightening them from the center out. Reinstall the remaining parts in the reverse order of removal, using new gaskets when connecting the exhaust pipes, and finally, run the engine to check for exhaust leaks.

For models from 2001 through 2006, the catalytic converter is an emission control device in the exhaust system designed to reduce pollutants, with two types available: a conventional oxidation catalyst and a three-way catalyst. These models feature three catalytic converters, including a warm-up three-way catalytic converter integrated into the front exhaust manifold and another in the pipe from the rear manifold, with the main exhaust pipe housing the final converter. Testing for a malfunctioning converter requires sophisticated equipment, so it's advisable to consult a dealer or authorized emissions inspection facility. During servicing, inspect the converter for leaks, corrosion, and damage, ensuring to check the welds and flange bolts; any damage necessitates replacement. Although failures are rare, plugged converters can occur, and a vacuum gauge can help diagnose restrictions in the exhaust system. To check for a restricted converter, connect a vacuum gauge to an intake manifold vacuum source, warm the engine, and record vacuum readings at idle and after throttle tests. If the final reading is significantly lower than the idle reading, a restriction may exist. For replacement, note that warm-up converters cannot be replaced separately; spray the exhaust flange studs with penetrating oil before removal, disconnect the flange at the rear, and cut the front connection to remove the converter, with installation following the reverse order of removal.

YES, THAT IS THE FIREWALL SIDE.

17173-20030 90080-43036

THIS DOES NOT COME WITH GASKETS

NO THE COVER IS RIGHT IN FRONT OF THIS PART

YES

yes it is

IT IS DRIVERS