I purchased certified pre owned car from dealership-Audi A4 3.0 quattro, 2005. 2 days later I could not pass required state inspection due to "check engine" issue-misfire on a 6th cylinder. I brought the car back to dealership a few days later to correct the problem. The problem was corrected temporarily and car passed the inspection-'check engine' light was reset by dealership. A few months later "check engine" issue came back after scheduled maintenance (at 50,000 miles) was done by authorized dealership. Problem was temporarily corrected 2nd time. In December 2008 after 3rd time "check engine" issue, dealership proposed to replace whole engine in order to resolve this issue, which was done. On February 11, 2009 driving back home from work I've noticed an exhaust gas smell inside the car, car was shaking and "check engine " light was "on"/not steady. I contacted Audi customer service advocates to report the problem and start the case. I brought the car back to dealership for repair 4th time. They performed necessary steps to correct the problem but failed (2 sensors were replaced according to them and "check engine" light still "on"). I was informed that dealership did not replace the whole engine back in December 2008 - they only replaced lower part of the engine knowing that there was a problem with misfire on 6th cylinder (upper part of the engine). After 3 weeks of waiting and constant repairs I am not sure that this problem has been corrected permanently. Facts: Car was purchased at 49,000 miles on April 29, 2008. My car has been at dealership for 75-80 days out of 10 months since I purchased it. Total mileage as of February 28, 2009 is 52,450.

- Brooklyn1, NY, USA

The contact owns a 2005 Audi A4. While driving 2-5 mph in reverse, the vehicle would not accelerate and the engine warning indicator light illuminated. The vehicle was taken to the dealer and they stated that the coil that distributes spark to the cylinders degenerated and lost power. The dealer replaced four ignition coils. The current and failure mileages were 52,000.

- Littleton , CO, USA