Front exhaust pipe (B258i)
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Front exhaust pipe (B258i)
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1.
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Disconnect the oxygen sensors' cables, undo the cable clamps and the clip and lift up the car.
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Important
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Do not twist the cables. The oxygen sensors are sensitive to blows and impacts and must be handle with care.
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2.
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Remove the oxygen sensors, one for each cylinder bank.
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3.
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Undo the joint between the front exhaust pipe and the catalytic converter.
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4.
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Unscrew the front exhaust pipe from the exhaust manifolds.
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Important
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There are seals between the exhaust manifold and the front exhaust pipe.
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2.
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Feed in the front exhaust pipe and bolt it to the exhaust manifold. Use new gaskets.
Turning torque 40 Nm (30 lbf ft).
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3.
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Bolt together the joint under the car.
Tightening torque 20 Nm (15 lbf ft).
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4.
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Refit the oxygen sensors. Lubricate the threads with Molycote 1000 prior to fitting.
Tightening torque 55 Nm (41 lbf ft).
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Important
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The oxygen sensors are sensitive to blows and impacts and must be handled with care. It is important that the connection between the oxygen sensors and the nipples is gas-tight.
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5.
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Lower the car and reconnect the oxygen sensors' cables. Refit cable clamps and clips.
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