One problem related to adaptive cruise control has been reported for the 2013 Audi A4. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2013 Audi A4 based on all problems reported for the 2013 A4.
2013 Audi A4 with a 2. 0 turbo engine approximately 62. 5k miles and up to date with all services. I was driving on the highway at highway speeds when the engine suddenly started to misfire with a partial loss of power making the car difficult to steer. At that time the check engine light was not illuminated. I was able to get off the highway and drive home about 2 miles away from when the misfires first occurred. The police did not get involved as I was able to return home. The following week the car was towed to my mechanic where it was diagnosed that cylinder 3 had a problem. At that time the check engine light illuminated. He recommended that I tow my car to the Audi dealership as they have better availability of parts. The dealer took apart the engine and diagnosed a broken piston ring which destroyed many other parts of the engine. The engine had to be replaced with a new one from the factory. Audi should be held accountable for catastrophic engine failures that may result in injury to others due to poor engine design.