Exhaust and Knock Sensor on 1999 Infiniti I30

How do I replace the Exhaust Gas Recurculation Flow Malfunction and Knock Sensor? The check engine light is on due to these issues, so any immediate answers would be helpful.

Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
2 answers
don't know u tell me
expensive guess for egr. are you sure it is bad. a lot of issues can cause this code that are not the valve.
forget the knock sensor code. it will not return once the flow code is resolved.

Roy