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Home >> Audi >> 1994 >> S4 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Self-Diagnostic System >> Hard Failures

Hard Failures

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Hard failures (a malfunctions that has been present for a sufficient time) can cause the MIL to come on and a code to set in Motronic Engine Control Module (ECM) memory. A code that sets as a result of a hard failure will not be erased automatically when the problem is eliminated. These codes must be erased manually.