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Home >> Audi >> 1990 >> 90 Quattro >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Basic Testing >> Ignition Checks >> Cis Digital Control >> Knock Sensor
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Knock Sensor

Knock sensor will produce a small voltage of about 50-70 millivolts if engine knocking is present. Check fuel quality, compression pressure, knock sensor and wiring circuits if knocking exists. No other tests are available from the manufacturer.

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