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The lift points are molded into the lower rocker panel. There are triangular indicators and sometimes ignorant people put the jack in the wrong place (so close, yet so far):
As stated the points are molded into the rockers. lift from those 4 points.
Before lifting pop the hood and leave it cracked. open both doors and leave them cracked. These cars don't like being lifted and if you don't crack the doors and hood before lifting they will not open.
After spending a grand on a roof for my baby, I always take the targa off when I am jacking just one part of the car up.... I treat the C4 like the wet noodle that it is when it comes to that overpriced plastic top.
Lift points on the car are labeled. Make sure you don't hit the floorboard, like one of the previous owners did with my car.