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Unfortunately, the TPS are always off by about 2-4 psi
ALmost always on the lower side.
They cannot be calibrated by porsche. They probably come like that from the Manufacturer... so those of us that are LAZY... and let it go lower then recomended have a little cushion of error.
Kinda like Fuel Gauge, when it shows empty, but you know you still have a few miles left in the tank.
So, as long as all 4 are consistently 2-4 below ACTUAL, then you should be fine.
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