One problem related to crankcase (pcv) has been reported for the 2007 Audi A4. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Audi A4 based on all problems reported for the 2007 A4.
Car started blowing white smoke and oil consumption increased to 1 quart per 500 miles. Dealership replaced pcv valve, which should have been replaced under csc-10043026-6562. However, since the check engine light never illuminated, the dealership and Audi refuse to cover this issue under the extended warranty, despite the fact that the defective part is specifically called out in their customer service campaign.