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A standard code reader is fine for most novice to experienced mechanics. Get the error codes, search for diagnosis on the net and trace down your problem. For more detailed info like actual fuel trims, cam deviation, and O2 sensor voltages a Durametric is the choice for most independent Porsche shops and enthusiasts who want to get very intimately involved with their car. In 8 yrs of ownership I have never wanted for a Durametric but some here couldn't live without them. Different horses for different courses...