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Home >> Audi >> 2007 >> Q7 4.2 >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> 4.2L - Generic Scan Tool - Engine Code: Bar (General Information) >> St Generic Scan Tool >> Description And Operation >> SCR NOX Catalyst System >> Reducing Agent Quality Sensor -G849-
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Reducing Agent Quality Sensor -G849-

The expected quality signal is divided by the quality sensor signal. The diagnostic compares this ratio to threshold limits.

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