The basic ones are just voltmeters that beep the number of times a current is present. You can make your own scanner by using a jumper and a voltmeter. I have a ScanTool, which tells you pretty much everything thet the computer monitors. I bought it from
www.actron.com I think it's great and I have learned alot about my car since i got it.
You can buy the basic ones (code Readers) at Sears for about 30.00
Good luck!
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Joe!
1988 GT, 167,000 miles!!! 13.58@105mph Check out my listing!
Click here! Or my website:
www.joe4speed.com
99 Ninja ZX-6R:10.32@135mph!
1993 Olds Eighty Eight LSS 16.40@88.8mph