Exhaust, front section

EXHAUST, FRONT SECTION

REMOVAL/REFITTING

1. Disconnect the two electrical connections of the lambda sensor.

1. Slacken the fastening screws and remove the engine support frame crossmember.

67 ÷ 74 Nm
6.8 ÷ 7.5 kgm

1. Disconnect the flange connecting the front section-catalytic converter.

2. Slacken the bolt fastening the exhaust pipe front section support bracket.

CATALYTIC CONVERTER

Closed loop mixture titration control is activated by the lambda sensor which detects the amount of oxygen contained in the exhaust gases upstream of the catalyst.

The measurements of the lambda sensor enable the control unit to continuously correct the mixture keeping the air/fuel ratio constant. This way harmful emissions to the exhaust are controlled and this is completed by the trivalent catalytic converter. The efficiency of the catalytic converter and as a result, the reduction of the harmfulness of the exhaust gases therefore depends on the air/fuel ratio with which the engine is supplied.

EXHAUST PIPE FRONT SECTION

1. Slacken the nuts fastening the front section of the exhaust pipe to the cylinder heads.

1. Remove the front section of the exhaust pipe.
   2. Remove the seals.

LAMBDA SENSOR

• Remove the lambda sensor and the support bracket from the front section of the exhaust pipe.