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Up for sale is an OBD-II Scan Tool. You can read/erase codes your car is throwing.
I found that this tool doesn't communicate with the OBD protocols of newer cars. Worked wonderfully on my 2002, my aunt's 2004 PT Cruiser, my ex's 2008, my co-worker's 2010 Altima. Doesn't talk to my 2018 civic at all though. That, and I have no use for it since I went with a BT setup with KTuner (which also doubles as OBD code reading)
Bought it for $60 new at a Kragen (yes, Kragen) when I was stationed up in WA state. Doesn't come with any documentation or anything, but operation is really straightforward. Plug it in to the OBD port, turn the car on, let it do it's thing. "E" button erases (2 click verification that you want to erase codes), the down arrow scrolls through various codes (if there are more than one being thrown), and the inward facing arrows sends a command to re-read the codes. It'll deliver the codes in the standard "Pxxxx" format that you can easily google. Perfect for stashing in your glove box.
Asking $25 shipped to US, $20 if you're local to Vegas and wanna meet up for a pickup. Shipping to Canada looks like it'll be $30. I'll eat some of the cost and and ask for $50USD to Canada. PayPal friends & family, PayPal Goods & services if you eat the fee (3%), or Zelle accepted. Leave no notes in Paypal comments and we'll deal with addresses and what have you over PM.