DTC memory (functions 02 and 05), checking and erasing: Notes

If the voltage supply is interrupted, the engine control module loses all the "learned" and/or "basic" values for oxygen sensor control, idling speed and charge pressure. Therefore considerable driving characteristic problems may occur depending on vehicle mileage.

In this case:

• Perform idling check → Idling check 
• Perform a longer test drive until the poor driving characteristics are eliminated.

Special tools, testers and auxiliary items required 

• scan tool VAG1551 or mobile scan tool VAG1552 with cable VAG1551/3B