Please state what kind of car and what year? Check the door switches to ensure they are functioning properly and not broke. Sounds like one of them has failed or is not contacting the door enough to cause it to open fully.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280