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[NYLexSC]

Go to Autozone or Pep Boys and ask them to use their OBDI scanner to read you your codes, they should do it without any charge, or maybe a minimal fee.

Other than that, you'd need an OBDI scanner or you can count the number of flashes of the CEL light and each one has a corresponding set of codes that could be the possible issue, not as specific as a scanner though.