6-6 SPECIAL INSTRUCTIONS FOR -SCR- EXHAUST SYSTEMS E UROCARGO Euro 4/5 Catalyzer Figure 6.5 126332 Catalyst, equipped with sound-proofing material, replaces the exhaust silencer. Inside the catalyst, the exhaust gas nitric oxides are, by reacting with ammonia, converted into free nitrogen and water vapour. Temperature sensors (1 and 2) and nitric oxide detecting sensor (3) are fitted onto catalyst . AdBlue reservoir Figure 6.6 108508 The nitrogen oxide catalytic reduction principle. AdBlue Base - January 2008 Print 603.93.431