Emptying tank for reduction agent — AUDI

🧭 Before you start

Fits: platform codes 2EA, 2FC

• Also covered elsewhere: Service net → Environment → Workshop disposal

🔧 Engine codes this applies to

📐 25 workshop diagrams for CKTB

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

📋 Procedure

1. ⚠ Observe safety precautions when working on the SCR system .Observe rules for cleanliness when working on the SCR system . — Unscrew cap from filler neck of reducing agent tank in engine compartment.
2. Close shut-off taps (A), (B) and (C).
3. Connect coupling (D) with connection to shut-off tap (A) and pressurise compressed air hose with compressed air.
4. Open shut-off tap (A).
5. Close shut-off valve (A) as soon as the pressure gauge registers a pressure of 0.8 bar.

6. Interrupt compressed air supply at compressed air hose, and disconnect coupling (D) from connection on shut-off tap (A).
7. Position SCR vacuum boxVAS 6557 in engine compartment, in immediate vicinity of filler neck.
8. Guide end of hose (E) into filler neck and as far as possible towards bottom of tank for reducing agent, and open shut-off tap (B). [Note: The reducing agent is then drawn from the tank and into the SCR vacuum boxVAS 6557 by the vacuum.The capacity of the SCR vacuum boxVAS 6557 is approx. 7 litres. Repeat the process if the reducing agent tank contains more than 7 litres of the reducing agent.Due to the length of the SCR vacuum boxVAS 6557 extraction hose, only a part of the entire tank content can be extracted.To fully empty the tank without removing it, pull the moulded hose of the filler neck off the upper part of the tank, and guide the SCR vacuum boxVAS 6557 extraction hose directly into the tank .A tank which has been partially emptied can also be removed.]
9. To empty vacuum boxVAS 6557, hold connection on shut-off tap (C) over suitable container and open shut-off taps (A) and (C).
10. ⚠ Never reuse extracted reduction agent.For information on storage and disposal, see Service net → Environment → Workshop disposal.Request country-specific information concerning storage and disposal from your importer. — Flush out vacuum boxVAS 6557 carefully using water when work sequence is complete.
11. Fill reducing agent tank 1.2.

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