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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-

Reducing Agent Quality Sensor -G849-

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