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Typically, the simple way to reset the Ad Blue light on your Ford Transit is by topping up the tank with Ad Blue. In some cases, a more extreme approach like draining and refilling it with a different brand could help if the sensor appears stuck. If these methods don't resolve the issue before resorting to taking it to the dealership for a potential software update, you could attempt a manual procedure if driving it several times did not resolve the light. Just turn on the ignition without starting the Transit, keep it on for at least 30 seconds, then switch it off entirely and wait roughly a minute before starting the vehicle normally.
Start the engine and step on the gas pedal. Wait until the light stops flashing, then switch off the engine. After 10 seconds, switch it on again and press the gas pedal twice.