Cut your steering wheel full right or left before you turn off the ignition and remove the key, and whenever you park - the steering lock will not engage when the wheels are full right or left. If that fixes the problem, you know that the problem is the steering column lock.

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Houston, Texas
1984 300CD 235K miles, Elvira, one owner
1987 300TD 180K miles
1974 TR6 78K miles Sarah Jane, one owner
OBK #27