These are AdBlue Indicator symbols, which references a fluid that is necessary to the Selective Catalytic Reduction (SCR) system. SCR is an emissions control technology used by some diesel engine manufacturers. The indicators may appear in Amber or Red, depending on the severity of need.
Both indicators include the text AdBlue, which is a fluid used in the system. The first indicator includes the image of a downturned bottle of fluid. When seen in Amber, it indicates that fluid is low. If it appears in Red, the system must have fluid added, or engine emissions will be excessive.
The second adds a wrench or spanner to the AdBlue text. In Amber, it indicates an issue with the system. In Red, the system needs immediate attention or damage may be done to the engine and/or its emissions control systems. Only a qualified service shop or dealer will be capable of repairing the system.
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