Ive been driving with my engine light on in my 93 6.2 for a year and it would come on an off. Now i got keen and read my codes with the paper clip trick and found I have a 15(Coolant temp sensor circuit), 32(EGR circuit), and 33, Mass Air Flow Circuit is high)

Now my coolant light also comes on from times to time shortly after i had a starter and glow plugs done.

Are these simple fixes? Should I just bring them into a shop?

Has anyone had similar issues. The truck runs great I am just annoyed with the light show on the dash.

 

These have unique code descriptions and the code #'s have different meanings from the gassers.

DTC 15 - Engine Coolant Temperature (ECT) Sensor Circuit High (Low Temp)
DTC 32 - EGR Circuit Error
DTC 33 - EGR Control Pressure/Baro Sensor Circuit High
Sounds like a broken/bad ground wire/connection?
Check ECM grounds for clean and secure contact-passenger side rear of intake.

 

I installed a new Coolant temp sensor and my code 15, and 32 went away. Now its a code 33.