currently my s2000 has started acting funny and im getting the eps light i jumped the codes and got 21,22,23 could yall shine some light on what i can do to trouble shoot these code thanks in advance

21- problem with voltage ig1

22- excessive change in vehical seed senser signal

23- problem with circuit speed signal

ive had the problem before and the first time it was the alternator second time it was the steering rack its been less then a year since both have been replaced