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Home >> Chevrolet >> 2004 >> Optra Base, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - 1.6L (L91) - Description And Operation >> Description and Operation >> Engine Control Module Description >> Intrusive Diagnostic Tests

Intrusive Diagnostic Tests

This is any on-board test run by the diagnostic management system which may have an effect on vehicle performance or emission levels.