A5 Quattro Coupe V6-3.2L (CALA) (2009)
Checking internal resistance
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Using a multimeter, check the Secondary Air Injection (AIR) Solenoid Valve 2 (N320) terminals 1 to 2 for resistance.
Specified value: 25 to 35 ohms (at approx. 20 °C)
If the specified value was not obtained:
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Replace the Secondary Air Injection (AIR) Solenoid Valve 2 (N320): Refer to appropriate service information.
If the specified value was obtained:
Checking voltage supply
Switch the ignition on.
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Using a multimeter, check the Secondary Air Injection (AIR) Solenoid Valve 2 (N320) electrical connector terminal 1 to Ground (GND) for
voltage.