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If you can pick up a scanner for 20 bucks seems liek a hard to believe price
You have to be careful what you buy on e-bay they are Chinese knock offs that do not work or break easily
You can buy a generic obd scanner for under 100 dollars that does not require a laptop and is more reliable
let me know if you have any other questions
Do the research yourself. Type "code scanner" on ebay motors and sort by price. There are many many items available for around $20.00 (buy it now). Even if there Chinese Knock-Off's I don't imagine the seller wants negative feedback for selling junk. I don't plan on using it professionaly I just seem to need one a couple of times a year. I can go to Autozone basicaly for free and wasn't planning on spending anywhere's near $100.00 to eliminate trips to the parts store. I'm not sure you addressed my question about the application of these described device/readers for $20.00.
I do know about the 20 dollars scanners and they are Chinese knocks off that sometimes do not work
It is your choice to buy one and hope it works
For the most part it will probably work for what you want to use it for
I do not know exactly what your question is at this point