S4 V8-4.2L (BHF) (2004)
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Remove front engine cover (arrows -1- and -2-).
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Bring lock carrier into service position.
Checking internal resistance
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Disconnect electrical harness connector from Secondary Air Injection (AIR) Solenoid Valve -N112- -arrow-.
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Connect multimeter at valve for resistance measurement.
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Specified value: 19 to 27 Ohms
If specified value is not obtained.
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Replace Secondary Air Injection (AIR) Solenoid Valve -N112-.
If specified value is obtained:
Checking voltage supply
