The lambda sensor is installed in the exhaust pipe before the catalytic converter. On 125 hp engines. the lambda sensor is installed in the exhaust manifold. On vehicles with six-cylinder engines, two lambda sensors are installed.
Withdrawal
Disconnect the lambda sensor electrical connector; which is located on the bulkhead of the engine compartment. Remove the sensor wiring from the mounting brackets.
Position the vehicle above a pit or on a lift.
Remove the lower mudguard of the engine compartment.
Unscrew the lambda sensor from the front exhaust pipe. On vehicles with 1.8-I engines, a VW-3337 key must be used to unscrew the lambda sensor. In the absence of such a key, to access the lambda sensor, it is necessary to remove the front exhaust pipe.
Installation
Apply a thin layer of Audi 3337/9 grease to the threads of the lambda sensor. When installing a new oxygen sensor, lubricant is already applied to its threads.
Screw the oxygen sensor into the exhaust pipe and tighten to 50 Nm.
Connect the lambda sensor electrical connector and secure the sensor wiring with brackets. Check that there is no contact between the electrical wiring of the lambda sensor and the exhaust pipe.
Install the lower engine compartment mudguard.
Lower the car to the ground.
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