Turbocharger for A3 LEON GOLF 5 OCTAVIA PASSAT TOURAN 1.9 TDI 90 105

  
Check the vacuum pump and its inlet strainer filter. If it is too clogged, it must be replaced, otherwise clean it. The entire filtration system must be replaced: oil filter, air filter, strainer, banjo bolt, vacuum pump if the strainer is too clogged.