Replacing the lambda probe
1. Disconnect the wire connector, loosen the wire clamp.
2. Lubricate the thread with assembly paste from an Audi workshop before installation. Paste must not get on the slots of the probe.
3. Correct tightening torque for the lambda probe: 50 Nm.
Plug connectors at the rear left in the engine compartment
- 1 - knock sensor II (blue);
- 2 - heating and lambda probe signal (probe left; black);
- 3 - ignition coils (lead wire; white);
- 4 - ignition timing sensor (black);
- 5 - engine speed sensor (grey).
Plug connectors at the rear right in the engine compartment
- 1 - heating and lambda probe signal (right probe; black);
- 2 - knock sensor I (blue).
Removing the air mass meter
1. Loosen the air intake hose clamp.
2. Disconnect the air mass meter connector.
3. Remove the upper part of the air filter housing with an air mass meter as described in chapter Air filter and suction channels.
Removing injection valves
injection valves (white arrows) can only be removed together with the fuel distributor pipe. To do this, loosen the mounting bolts of the distribution tube (black arrows).
1. Remove the suction hose between the air filter (air mass meter) and engine.
2. Disconnect and set aside high voltage wires.
3. Disconnect the injection valve connectors.
4. Unscrew the fuel distribution pipe from the intake manifold on the engine.
5. Disconnect the vacuum hose from the fuel pressure regulator.
6. Lift up the fuel distribution pipe with injection valves from the intake manifold on the engine.
7. To dismantle a separate injection valve, remove the retaining clip from the distribution tube and remove the valve.
8. Mounting: before mounting, replace the rubber O-rings on all injection valves.
9. Lubricate all rubber O-rings with new engine oil.
10. Insert the injection valves very carefully, one at a time, so that none of the rubber O-rings is crushed or damaged.
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