Check engine light problem

AllenMon

Newbie
Yesterday I was driving around town and my oil check light came on.I started it back up and after about a minute the light went off. Oil level is at full. This morning on the way to work the light comes on again!!
gonna buy one scanner to read car codes and do some home diagnose
and saw that GM Tech2, the best tool for GM
but this Tech2 at UOBD2 quite expensive....

any other devicces like the tech2 that is more affordable???
 
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