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| Vacuum hoses and hose connections do not leak. |
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| Vacuum hoses are not clogged. |
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| Disconnect hose for secondary air system -arrow- and connect test hose to hose leading to combination valve for secondary air system. |
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| Blow lightly into test hose with your mouth (do not use compressed air). |
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| The combination valve for secondary air system should be closed; it should not be possible to blow through the hose. |
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| Blow into test hose with your mouth using more pressure (do not use compressed air). |
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| The combination valve for secondary air system should open; it should now be possible to blow through the hose. |
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| Renew combination valve for secondary air if you cannot determine the switching point → Chapter. |
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