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Originally Posted by DrCactus
How do I do this? If problem comes up what needs to be repaired ? Is this a serious issue that I should stop driving car or whats the result if I keep driving
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Fuel trims require the use of a Porsche specific scan tool (PST II, PIWIS, Durametric system) and will tell you the exact air/fuel rations for each bank. The one that comes up out of spec tells you what kind of issue (overly rich/overly lean) you have and where it is.
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