Symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

Tech Notes

There is a factory service bulletin for the P3138 code for the following models: Audi A3 2005 and 2007 Audi A4 2005 and 2007 Audi A4 Cabriolet 2007 Audi TT 2008 Audi P3138 Code Serive Bulletin