Check Engine Light Due to Vacuum Leaks, Oxygen Sensor, or Catalytic Converter Fault on Audi A4 Quattro

Submitted by Vehicle Owner · May 29, 2025
Published by RepairPal

Problem overview

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

125 people reported this problem
44 comments
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Audi A4 Quattro vehicles with this problem

13 model years affected
Average mileage: 122,644 miles
(45,000 - 210,000)

Repairs related to this problem

Catalytic Converter Replacement

The average cost for a Audi A4 Quattro Catalytic Converter Replacement repair is between $3,004 and $3,760.

Check Engine Light Diagnosis & Testing

The average cost for a Audi A4 Quattro Check Engine Light Diagnosis & Testing repair is between $198 and $291.

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