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I'm considering purchasing on old 2004 Cayenne Turbo with 312,000km (194,000 miles) and wanted to get some information on what significant failures I could expect to deal with at that sort of mileage. The car has two issues that need addressing right off the bat, the first being that the transmission valve body is failing causing erratic shifts. There is also an undiagnosed check engine light. Having test drove the car, the engine felt smooth and didn't have any odd noises coming from under the bonnet although it felt like there was considerably less power than the 450HP that it left the factory with. I know these engines are fairly solid reliability wise even with significant mileage, but how do critical components such as timing chains and turbochargers hold up after 200,000 miles, and when can you expect them to fail?

Do you even think a Cayenne Turbo with mileage this high is worth it, or is keeping it on the road going to be an uphill battle?
 

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Is it worth it? Here's what I would consider in making a decision.
  1. What's the purchase price
  2. What are known issues and costs to repair
  3. How many owners has it had
  4. How do you feel about working on the vehicle yourself?
With those questions answered, I'd have a decision.
 
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