BMW 11627500483 Exhaust Manifold

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To avoid damaging oxygen sensors, remove them prior to exhaust manifold removal and ensure not to mix up oxygen sensor connectors by marking them before disassembly. Use new hardware and gaskets when reinstalling exhaust manifolds. Begin by removing the intake manifold cover and separating the post-catalyst oxygen sensor connectors. With the engine fully cooled, work above the exhaust manifolds to separate and remove the precatalyst oxygen sensors. Safely raise and support the car, then remove the front end reinforcement, ensuring to follow the proper procedure to avoid chassis or front end damage. Next, remove the front stabilizer bar mounting brackets and rubber mounts, and detach the stabilizer bar links. Separate the rear mufflers from the center muffler, then remove the center muffler. Proceed to remove the post-catalyst oxygen sensors and the exhaust manifold mounting nuts, followed by the removal of the front and rear exhaust manifolds along with their catalytic converters. For installation, reverse the removal steps, ensuring to clean sealing surfaces, replace gaskets, replace manifold and front pipe mounting nuts, and coat fastener threads with anti-seize paste.

New hardware and gaskets should be used when reinstalling the exhaust manifolds.

Pre- and post-catalyst oxygen sensors are mounted in each exhaust manifold.