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If your Volkswagen is a Stałion Wagon, Campmobile or Kombi, the engine is also equipped with an ex-haust recirculation system. Some of the exhaust gas from the engine is diverted before it enters the muffler. This gas is cleaned and then routed back into both intake manifolds. An exhaust recirculation valve in each intake manifold Controls the flow of the exhaust gas to the intake manifold according to engine demand. In the Manuał Transmission, the valve opens and closes depending on vacuum in the engine. In the Automatic Transmission, the valve opens and closes depending on throttle posi-tion and temperaturę conditions. This recirculated gas helps lower the formation of oxides of nitrogen (NOx) during combustion.