P0421
P1113
P1311
P1458
Should I change the front o2 sensors out? I have read doing this would also take care of the EGT code and possibly help get rid of the p0421

Also my gauge cluster is all fuzzy is this a bad gauge, and if so can i replace it or does it need to go to the dealer?

 

Something similar happened to me. What I did is clean the Mass Airflow Sensor and the code for the O2 sensors and the catalytic converters have not come up. Depending on the mileage of your car, it might be a good idea to change them since from what I've heard they should be replaced around every 100k miles. This is only a suggestion because I am by no means a mechanic.