2000 saab 9-3, what parts cause codes P1334 and P1312?

Question

Need to repair to clear codes

Answer 1

P1334 Combustion detection 3+4 open circuit / short to B+

P1312 Combustion detection 1+2 open circuit/ short to B+

Sparkplugs need to be check and the proper required sparkplug are neede, what cause these two code is the ignition module, a repalcement may need to be required, and make this a hobby