The generator matrix

 1  0  0  0  1  1  1  1  1  2  1  1  1  1  1  1  1  1  1  1  1  1 2a+2  1  1  1  0  1  1 2a 2a  0  0  1  1  1  1  1  1 2a  1  2  1  1  1  0  1  1  1  1  1  1  1  1  1  1  1 2a+2  1
 0  1  0  0  0  2  2 2a+3 2a+1  1 3a 3a+3 a+2 a+3 a+1 2a 3a 2a+2 2a 2a+1 a+3 2a+1  1  3 3a+1 3a+2  1 3a+2 2a+3  1  1  2  1 a+3 3a 3a+3 2a 3a  3  1 3a+1 2a 2a+1 a+2  3  1 2a+1  1  0  3 2a+2 2a  2  a 3a+1 2a+1  2  1  0
 0  0  1  0  1 3a+2 a+1  a 2a+2 3a+2 2a+3 3a+1  a 3a+2 3a+3  0 3a 3a+3  a a+3  0  1 3a+1 3a 2a+1 a+2  1  1 2a+3  2 a+2  1  3 2a+3 2a+2  a 2a+1  0 3a a+2  a  1  3 2a+1 2a 2a 2a+1 2a+2  a a+1 2a+2 2a+1 3a+3  1 a+3  2  0  0 a+3
 0  0  0  1 3a+3  a  1  2 a+2 a+2  0  2 3a+1 2a+3 3a+1 a+2  0  2 a+3  a 3a+1  3 2a+2 2a+1 a+2 2a+1  a 3a+3 3a+2  1  3 3a+1 2a 2a+1  3 a+1 3a+2 2a+2  3  2  3 2a+3 a+1 2a+1 3a+1 a+2 a+3  1  0 2a 3a+1  0 a+2 2a 3a+1  3 2a+2 3a+1 a+1
 0  0  0  0  2  0 2a  0  0  0  2 2a  2 2a  2 2a 2a+2 2a+2 2a+2 2a  0  0 2a  2  0 2a 2a 2a+2  2  2  0  2  0 2a+2  0 2a  2 2a+2 2a+2 2a  0 2a 2a+2 2a+2  2 2a+2 2a 2a 2a+2  0 2a+2  0  0 2a 2a+2  2  2  0 2a

generates a code of length 59 over GR(16,4) who´s minimum homogenous weight is 158.

Homogenous weight enumerator: w(x)=1x^0+432x^158+576x^159+735x^160+348x^161+3240x^162+2712x^163+2295x^164+1488x^165+7836x^166+6048x^167+5253x^168+2316x^169+13524x^170+10920x^171+8307x^172+4452x^173+21048x^174+14844x^175+11664x^176+6144x^177+25404x^178+16872x^179+12780x^180+5688x^181+23004x^182+13416x^183+8328x^184+3228x^185+12540x^186+6888x^187+3243x^188+852x^189+3264x^190+1308x^191+546x^192+60x^193+300x^194+144x^195+30x^196+21x^200+24x^204+6x^208+3x^212+6x^216+6x^220

The gray image is a code over GF(4) with n=236, k=9 and d=158.
This code was found by Heurico 1.16 in 231 seconds.