| Even small amounts of dirt can cause faults. When working on the fuel supply system, injection system, turbocharging/supercharging and charge air cooling system, pay careful attention to the following basic rules: |
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| Carefully clean connection points and the surrounding area with engine cleaner or brake cleaner and dry thoroughly before opening. |
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| Seal off open lines and connections with clean plugs or sealing caps immediately. |
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| Place parts that have been removed on a clean surface and cover them over. Use only lint-free cloths. |
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| Only install clean components; replacement parts should only be unpacked immediately prior to installation. Do not use parts that have not been stored in their packing (e.g. in tool boxes etc.). |
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| When the system is open, do not work with compressed air and do not move the vehicle. |
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| Protect unplugged electrical connectors against dirt and moisture and make sure connections are dry when attaching. |
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