Exhaust Manifold: Service and Repair

Removing and installing, sealing or replacing both exhaust manifolds with catalytic converter

Remove Lambda control sensors, refer to Powertrain Management, Computer Control Systems, Oxygen Sensor, Service and Repair.





E46 only:
Remove microfilter.
Open cable duct on lower section of microfilter housing (2) and feed out cable(s).
Release screws (1) and remove lower section of microfilter housing (2).





Fit special tool 00 0 200 to special tool 00 020/202/204/208 and attach.
Secure special tool 00 0 200 to the front suspension lug on the engine.

Note: The supports (1) of special tool 00 0 208 must rest on the bolt connection of both side walls.





Tighten the screws (1 and 2).





Raise engine with special tool 00 0 200 approx. 5 mm.

Remove exhaust system.
If necessary, remove front end reinforcement.
Remove right engine support arm with engine mount.





Remove cover from injection valves.

Note: The Lambda monitor sensors for cylinders 1 to 3 and 4 to 6 must not be mixed up at the plug connection to the wiring harness.

Mark plug connections.
Unclip the cable from the retainer.
Disconnect plug. Unclip cable on rear side of engine from cable guide.
If necessary, remove oxygen monitor sensors.

Note: Release first front and then rear exhaust manifold with catalytic converter.

Remove exhaust manifold with catalytic converter.

Installation:
Clean sealing faces, replace gaskets.
Coat thread with copper paste -CRC-.
Replace nuts.
Tightening Torque, refer to Engine, Specifications, Mechanical.