| Working on the reducing agent metering system - vehicles with SCR catalytic converter |
| When working on the reducing agent metering system, note the following warnings: |
WARNING | Reducing agent can cause skin irritation. |
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| Avoid contact with the skin and eyes. Wear protective gloves. |
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| If your skin has come into contact with reducing agent, rinse it off with soap and water. |
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| If reducing agent gets into your eyes, rinse them out with water for several minutes. |
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| Do not breathe in or swallow reducing agent. |
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| If you have swallowed reducing agent, rinse your mouth, drink lots of water and consult a paramedic or doctor immediately. |
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| When removing and installing components at the reducing agent metering system, note the following: |
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| The active and passive tanks for reducing agent must be empty when you are working on the reducing agent metering system. Refer to the corresponding work description to find out when the active or passive tank must be drained. Drain the active or passive tank if necessary. Procedure for active tank → Chapter; procedure for passive tank → Chapter. |
| When removing and installing the active or passive tank, note the following: |
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| The active or passive tank for reducing agent must be empty. Drain the active or passive tank if necessary. Procedure for active tank → Chapter; procedure for passive tank → Chapter. |
| Automatic sucking back of reducing agent |
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| After the ignition is switched off, the reducing agent is automatically drawn back into the active tank from the metering line going to the injector for reducing agent -N474-. |
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| Before performing work in this area, you must therefore wait until the reducing agent has been drawn back; this can take up to 10 minutes after the ignition has been switched off. |
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| It is also important to wait until the reducing agent has been drawn back (i.e. 10 minutes) before disconnecting the battery → Electrical system; Rep. gr.27. |
WARNING | Safety risk due to escaping reducing agent. |
| To prevent large amounts of reducing agent from escaping when the metering line is opened, wait until the reducing agent has been drawn back automatically → Anchor. |
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