B1223 - b1226 for 2000 pontiac sunfire - what parts do I need to replace?

Question

check engine light on and won't go through emissions. Need to fix but would like to try myself to save money. Giving codes B1223, B1224, B1225, B1226. But no one can tell me what I need to replace without coming in and paying them over $100 to get the codes on their machine and then tell me what they are.