In the 126 there is a vacuum actuator that locks the gas cap door when the doors lock. Assuming the other doors lock/unlock, you might have a bad actuator or actuactor linkage at that "door" only. There is a manual release (cable loop pull) on the inside of the trunk...filler neck side. The 201 may be similar.
Bruce (I could be wrong) E.
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The Golden Rule
1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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