Engine Codes on 92 Loyale EA82 with A/T non turbo

[Cyama]

Hi Guys, 

I've been intermittently having a check engine light and lately its been a little more steady. I pulled the cover on the dash and plugged in the white terminals to read the light on the ecu. 

92 Loyale EA82 with A/T non turbo

 

It sends the following: 

 

_ _ _ oo

 

_ _ _ oooo

 

_ _ o

 

So is that: 

 

32  O2 sensor

34 EGR Solenoid

21 Coolant Temp Sensor

 

Do I need to replace all of these sensors, or is one relate to the other?