why oh why do i have the 3 amigos on me dash old salli is 20 years old never missed a beat. shes a disco. and we need her so i trawled the youtube and found out it could be a shuttle valve this vid shows you hopefully how to eliminate this problem as it is a mot failure.good luck.
 
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I7pha4t.jpg
 
Welcome to the forum.
Clear the faults with a diagnostic tester and quickly get it MOT'd.
 

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