Front exhaust pipe (B258i)
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Front exhaust pipe (B258i)
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1.
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Unplug the oxygen sensors' leads, undo the cable clamps and clips and raise the car.
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Important
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Do not twist the leads. The oxygen sensors are sensitive to knocks and jolts and must be handled with care.
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2.
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Remove the oxygen sensors, one for each bank of cylinders.
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3.
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Unbolt the joint between the front exhaust pipe and catalytic converter.
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4.
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Unscrew the front exhaust pipe from the exhaust manifold.
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Important
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Gaskets are fitted between the exhaust manifold and front exhaust pipe.
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2.
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Position the front exhaust pipe and screw it to the exhaust manifold. Fit new gaskets.
Tightening torque 40 Nm (30 lbf ft).
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3.
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Bolt together the joints under the car.
Tightening torque 20 Nm (15 lbf ft).
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4.
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Fit the oxygen sensors, but first lubricate the threads with Molycote 1000.
Tightening torque 55 Nm (41 lbf ft).
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Important
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The oxygen sensors are sensitive to knocks and jolts and must be handled with care. It is important to ensure that the connections between oxygen sensors and unions are gastight.
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5.
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Lower the car and plug in the oxygen sensors' leads. Fit the cable clamps and clips.
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