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I need YOUR help! This could be our worst nightmare as Cayenne owners...I am hoping im wrong. I should mention I am very mechanical (Master level weekend wrench turner, not professional). The bullet points of the scenario: 2008 Cayenne GTS, 98K,Manual Transmission, well maintained, in excellent shape and runs (or ran) flawlessly. 1. Thought battery was going dead due to engine not turning over quickly. 2. Replaced battery, Engine did not make any change... in fact, was getting worse. Would barely turn even a little bit. 3. Hooked up battery to charger to be 100%, no change. The battery would nearly drain completely after a few turns of the key. 4. Replaced starter with new Bosch. Replaced plugs for maintenance. 5. Absolutely no change. The car clicks, tries to turnover, it wont budge. Battery drains very quickly after a few tries. No major codes on Durametric. Although maybe I am looking in the wrong place. I can only surmise the worst case scenario. Please, any insight or help would be greatly appreciated.