Contributing to the employer's 401(k) in and of itself does not make the traditional IRA contribution an excess contribution, it only makes it a nondeductible contribution if your AGI is too high. Only if you were age 70½ or older or you had too little compensation left to support the traditional IRA contribution after contributing to the 401(k) (or you contributed more than the annual limit for IRA contributions) would it have been an excess contribution that would have required removal.
Please verify whether or not the contribution was an actual excess contribution for some reason that you have not yet identified or if this was simply a nondeductible contribution. The reason you gave for this having been an excess contribution is not a valid reason by itself.
Assuming that the contribution for 2016 was simply a nondeductible contribution, not an excess contribution, apparently the IRS only disallowed the deduction for the contribution, not the contribution itself. Assuming that this is the case, you need to have filed a 2016 Form 8606 to report the nondeductible contribution. In 2019 TurboTax you would then tell TurboTax that you made and tracked nondeductible traditional IRA contributions, enter the amount from line 14 of the 2016 Form 8606, enter your 2019 year-end balance in traditional IRAs, then TurboTax would calculate on your 2019 Form 8606 the taxable amount of your distribution and how much of the amount from line 14 of the 2016 Form 8606 remains in your traditional IRAs to be applied to future distributions, making a portion of each of them nontaxable.
