A yellow recharge AdBlue light means that action is required
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The yellow warning will appear when the remaining range of AdBlue is approximately 1,000 miles. This warning is repeated every 31 miles and is accompanied by an audible tone. If these warnings are not acted upon, the warning turns red; once this happens the car will not restart once the ignition is turned off.
This is not a fault, but a required feature of the system. If this stage is reached the system will need a full top-up before the car can be restarted. Further information is available in the vehicle handbook.