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If the radiator cap is not sealing properly this will cause this fault here and a new cap is needed that will fit and seal.When the cap is not sealed this allows the coolant to boil and over flow.
If this is done or checked and found o.k. the other issue can be a leaking cylinder head gasket that allowed an over heat issue causing this fault here.This would need to be checked into further to see if this is the cause here.
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