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Audi S4 Check Engine Light Due to Vacuum Leaks, Oxygen Sensor, or Catalytic Converter Fault

 
Audi S4 Problem
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Model Years Affected: 2000, 2001, 2002

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Vacuum leaks, oxygen sensor failure, and catalytic converter efficiency faults can cause the Check Engine Light to illuminate.

  • Visitor, , 149,000 mi

    My check engine light hardly ever goes off. The problem from day one has been the oxygen sensors. I have had them replaced twice within the last three years and the problem has not gone away.

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