Check Engine Light On problems of the 2002 Audi A4

I am writing regarding a sad story about my 2002 Audi A4 quattro 3. 0 sedan . While I realize that the car is not new, and with 152,000 miles on the road; I am still disappointed with the series of events that has happened to me, not once, but twice now! about a week ago, as I turned the engine on, I heard a loud knocking like something had been hit and fallen apart in the engine. At the same time, the check engine light came on (flashing). I took it to my trusted mechanic. At this point, I am thinking that the issue was with a coil – but not really since they have been replaced and not that long ago, might I add! while the car was being inspected, the mechanic heard a noise coming from camshaft adjusters. Once they opened the case, they found screws lose that had literally fallen off and broken. The camshaft adjustment housing was also damaged, amongst other parts (I have pictures). How can this be possible? after all, the bolts are encased, and it is not like anyone messed with them. The sad part is that the same had happened on the other side a year ago.

My Audi A4 1. 8 turbo engine may have sludging problem - 80k miles. Car engine oil light illuminating after driving long distances - about 1. 5 hours on the road going approx 60-70 mph. But oil levels are actually fine. Oil light does not illuminate when driving in local commuting area. Audi will only cover the fix if consumers have receipts for oil changes performed within the 10k recommended mileage. I have to pay $2750 estimated to fix the problem - some engine sludging and oil pressure low. Audi will not cover. Note that owner's manual recommends oil changes every 10k and does not indicate that these 10k oil changes must be done at those intervals. Many of these engines manufactured by vw are failing. If the oil absolutely must be changed within 10k or 12k miles or engine sludging/failure will occur - proper notice should be given in owner's manual to indicate that they oil changes absolutely must be performed at 10k miles or engine failure will occur and a high red alert message should be displayed in the dash when system's check is performed by driver. This is a defective engine which poses a safety hazard on the road and should be recalled !!! I actually took my vehicle into the dealership at 16,674 miles because check engine light was illuminating on the dash, dealership indicated ignition coils were bad and replaced.

While driving the vehicle the engine light would intermittently illuminate and heavy vibration forced consumer to pull off the road, due to a faulty engine coil. The dealer changed the faulty coil. One month later, the replaced coil failed. Dealer refused responsibility. . Ph.