Table of contents: Replacing lambda probes ↓ Further removal of the catalytic… ↓
1. Remove the engine cover in the engine compartment, refer to Section Removal and installation the upper engine cover/lower engine compartment protection/subframe.
2. Remove the coolant expansion tank.
3. Disconnect the coolant temperature gauge connector. Disconnect the expansion tank and set it aside. Do not disconnect the coolant hoses.
4. Disconnect the AKF valve (1). Remove the screws (arrows in the accompanying illustration) and remove the air suction hose.
5. Disconnect the air intake hose (1) from the hose (2). Remove the hose from the bottom of the air intake pipe.
6. Remove the air filter housing, refer to Section Removal and installation the air filter.
7. Disconnect the connector (2) of the lambda probe 2, located after the catalytic converter.
8. Disconnect the connector (5) of the lambda probe 1, located in front of the catalytic converter. (1) – knock sensor, (3) – engine speed sensor, (4) – knock sensor 2.
Replacing lambda probes
1. Unscrew the lambda probes.
2. Lubricate the threads of the lambda probes with high-temperature paste G 05212A3. The paste should not get on the housing spline.
3. Secure the lambda probes with torque 55Nm.
4. If only the lambda probes were replaced: Connect the connectors (2) and (5) of the lambda probes.
Further removal of the catalytic converter
1. Disconnect the catalytic converter/exhaust manifold bolt connection (arrows in the accompanying illustration).
Warning: The operation of lifting and installing the vehicle on stands is associated with danger! Therefore, before carrying out the operation, read Section Jacking and towing.
2. Raise and place the vehicle on stands.
3. For vehicles with parking/additional heating: Remove the bolts (arrows in the accompanying illustration) fastening the exhaust pipe of the parking/additional heating to the lower cover of the engine compartment.
4. Remove the lower engine compartment cover, refer to Section Removal and installation the upper engine cover/lower engine compartment protection/subframe.
5. Remove the cover above the right drive shaft.
6. Loosen the mounting bolts and disconnect the catalytic converter from the pre-pipe (arrows). Remove the catalytic converter upwards
Caution: Protect the catalytic converter from impact.
The original source of the article can be found on the website: AudiManual.ru