What section are you in?
You don't enter 401k contributions into TurboTax anywhere. Your 401k contribution has already been recorded in Box 12 code D on your W-2. If you made contributions through your employer, then entry of your W-2 is all that is needed.
IRA contributions are entered in the retirement section, not 401K's. IRA's have contribution limits of $5,500 ($6,500 if over 50).
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