I use one of the older "blinking LED and beeper" types.
This one looks like it stores the codes in memory so you don't have to count
the beeps while trying to write the codes down on paper.
If you're really cheap, you can also use a 2" piece of wire.
Example # 3 in:
I used a Equis scanner on my 90 SHO it seemed to work well I don't know what
the model number was but it was only 40 bucks and worked well it gives more
codes that the check engine light, and it works on the ABS system as well
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