The generator matrix

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

generates a code of length 20 over Z4[X]/(X^2+2) who´s minimum homogenous weight is 16.

Homogenous weight enumerator: w(x)=1x^0+112x^16+160x^17+556x^18+608x^19+1259x^20+608x^21+512x^22+160x^23+91x^24+20x^26+9x^28

The gray image is a code over GF(2) with n=160, k=12 and d=64.
This code was found by Heurico 1.16 in 0.078 seconds.