A red recharge AdBlue light means you should stop the car as soon as it's safe
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The red warning appears when there is no AdBlue range left; 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.