Several years ago , I was trying to bring a 1996 Chevy Lumina 3.1l back into service . I got tired of taking it to AutoZone and O'Reilly to get the codes cleared . I purchased a basic $ 50 code reader / clearer from AutoZone .Having a code reader and being able to clear them makes all the difference in the world. I bought one for $20 at Walmart. It's not high tech but it get the job done.
Have used it on several vehicles since .