The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  X  0  X X^3+X^2  X  0  X X^3+X^2  X  X  1  1  1  1  X X^3  X X^2  X X^3  X X^2 X^2  0  0  1
 0  X X^3+X^2 X^2+X  0 X^2+X X^3+X^2 X^3+X X^3 X^3+X^2+X X^2 X^3+X X^3 X^3+X^2+X X^2  X X^2+X  X X^3+X  X X^2+X  X X^3+X  X  0 X^3+X^2  0 X^3 X^3+X^2 X^3+X^2 X^3+X^2+X  X  X  X X^3+X^2+X  X  X  X X^3+X^2  X  X  0
 0  0 X^3 X^3 X^3  0  0 X^3 X^3 X^3  0  0  0  0 X^3 X^3  0 X^3 X^3  0 X^3  0  0 X^3 X^3 X^3  0 X^3  0 X^3 X^3 X^3  0  0  0  0 X^3 X^3 X^3  0 X^3  0

generates a code of length 42 over Z2[X]/(X^4) who´s minimum homogenous weight is 40.

Homogenous weight enumerator: w(x)=1x^0+18x^40+90x^41+57x^42+60x^43+12x^44+10x^45+6x^46+1x^52+1x^62

The gray image is a linear code over GF(2) with n=336, k=8 and d=160.
This code was found by Heurico 1.16 in 0.047 seconds.