Removing and installing activated charcoal filter - all vehicles except Audi A6 hybrid — AUDI
Removing and installing activated charcoal filter - all vehicles except Audi A6 hybrid on Audi: 8 steps, engines CAEB, CAED, CDNB, CDZA.
The activated charcoal filter collects fuel vapour from the tank and sits under the car at the rear left, behind underbody trim, on the 4G and 4X platforms covered here (for the 4G that is the A6/A7 C7 2011–2018; the A6 hybrid is excluded). It applies across a long list of petrol engines. Access is from below once the underbody trim is off. Three lines go to it: the vent line, the breather line from the fuel tank and the breather line to the activated charcoal filter solenoid valve N80. Each is a plug-in connector, and the filter itself is held by three bolts. The work is simple; what matters is keeping dirt out of the open lines and making sure each connector engages audibly on refitting.
🧭 Before you start
Observe the fuel system safety and cleanliness rules, then remove the rear left underbody trim. Detach the vent line, the tank breather line and the line to solenoid valve N80, unbolt the filter and remove it. Fit the new filter, reconnect all three lines until they click and refit the underbody trim.
Fits: Audi A6/A7 C7 (4G, 2011–2018); platform code 4X
Don't miss
- Cap or cover the open vent and breather lines; keep dirt out of the evaporative system.
- Each line connector must engage audibly when reconnected.
- Note which line goes to the tank and which to solenoid valve N80 before disconnecting.
- Do not confuse this procedure with the A6 hybrid, which is excluded.
Written for this job from the workshop steps below · TorqFix editorial.
🔧 Engine codes this applies to
📋 Procedure
- Observe safety precautions .
- Observe rules for cleanliness .
- Remove underbody trim (rear left) General body repairs, exterior66Underbody trim; Removing and installing underbody trim.
- Detach vent line (1). Disconnecting plug-in connectors
- Detach breather line (3) leading to fuel tank. Disconnecting plug-in connectors
- Detach breather line (5) to activated charcoal filter solenoid valve 1N80. Disconnecting plug-in connectors
- Unscrew bolts (2, 4 and 6) and remove activated charcoal filter.
- Connect vent and breather lines so they engage audibly.
Other AUDI procedures
- Checking fuel gauge sender 2G169 - A5 from model year 2012 onwards, A4 from model year 2013 onwards, rest-of-world vehicles with four-wheel drive, USA vehicles with front-wheel drive/four-wheel drive
- Removing and installing fuel filter - A5 up to model year 2011, A4 up to model year 2012
- Removing and installing poly V-belt - vehicles with electromechanical power steering
- Removing and installing tensioner for poly V-belt - vehicles with electromechanical power steering
- Removing and installing charge air cooler - vehicles without hybrid drive
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- Removing engine – Audi A8 D3 · 41 torque figures
- Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
- Installing engine – Audi A8 D4 · 36 torque figures
- Removing and installing camshaft timing chain · 29 torque figures
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
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The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.