Removing and installing front exhaust pipe with catalytic converter — AUDI

🔧 Engine codes this applies to

📐 60 workshop diagrams for AFB

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Lift off engine cover (arrows).
2. If fitted, detach cover (1) on right of engine compartment.
3. Disengage solenoid valve 1 for activated charcoal filter system N80(item 1) at air duct.
4. Unscrew bolts (arrows).
5. Remove air duct (2).

6. Unplug electrical connector (4) at air mass meter G70.
7. Move electrical wiring at air cleaner housing clear.
8. Pull off air hose (1) to secondary air pump.
9. Detach air intake hose (3) at air mass meter G70.
10. Remove fastener (2) and detach air cleaner housing.
11. Detach vent hose (2) leading to exhaust gas recirculation valve N18.
12. Disconnect hose (4) for crankcase breather system at air pipe.
13. Detach air pipe (3) at the throttle valve module J338. [Note: Disregard (item 1).]
14. Unbolt coolant expansion tank (arrow).
15. Unplug electrical wire for coolant shortage indicator switch F66 at bottom of expansion tank and move expansion tank to one side with coolant hoses (1) and (2) attached.
16. Unplug electrical connectors (1) for Lambda probe after catalytic converter G130 and (4) for Lambda probe G39.
17. Move wires clear towards bottom of vehicle. [Note: Disregard items marked (2) and (3).]
18. Unscrew bolt connections at catalytic converter/exhaust manifold (arrows).
19. Vehicles with auxiliary heater: remove bolts (arrows) securing exhaust pipe for auxiliary/additional heater to noise insulation.
20. Release quick-fasteners (1) and (2) and take off front noise insulation.
21. If fitted, release quick fasteners (3) and remove rear noise insulation.
22. Unbolt heat shield (1) for drive shaft (right-side).
23. Unscrew nut (2) at bracket for front exhaust pipe. [Note: Disregard (item 1).] [Note: To avoid any damage, the flexible joint in the front exhaust pipe must not be bent more than 10°.]
24. Separate exhaust system at clamp (arrows).
25. Remove front exhaust pipe with catalytic converter. [Note: Renew seals and gaskets.Reinstall all cable ties in the same locations when assembling.Secure all hose connections with the correct type of hose clips (same as original equipment) Parts catalogue.]
26. Align exhaust system free of stress .

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