A4 Quattro Sedan L4-2.0L Turbo (CAEB) (2009)
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PROM - Programmable Read Only Memory: Customer Interest
Engine Controls - Rushing Air Noise On Cold Start Up
01 Rushing air sound from air cleaner housing at cold start
24 10 15
2023183/1
April 6, 2010
Affected Vehicles
Condition
The sound of rushing air, similar to a secondary air pump noise, can be heard during the initial cold start for up to ninety seconds.
Technical Background
Electronic and mechanical adjustments influence the air flow characteristics in the intake system during the catalytic converter heating phase. This
airflow creates sound waves that can be heard at the left front of the vehicle (air cleaner housing area).
The new software will change the air flow characteristic and reduce the noise level.
Production Solution
Service
1. Follow all instructions in the attached TSB 2011732 00 Software Version Management (SVM), operating instructions.
2. Update the instrument cluster (J285) using the SVM action code as listed in the table above if necessary.
