S4 Quattro Sedan V6-2.7L Turbo (APB) (2000)
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Remove engine cover (arrows).
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Disconnect connector from solenoid valve.
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Connect multimeter at valve for resistance measurement.
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Specified value: 10 ... 18 Ohms
If specified value is not obtained:
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Replace valve.
Checking voltage supply
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Disconnect connector from solenoid valve.