In this post, you’ll learn all the most likely causes of a scanner that won’t turn on, how to diagnose them and how to fix them. Checking the vehicle’s fuse box and replacing the blown fuse fixes the issue. If the check engine light fails to aluminate, you can be sure the fuse has blown. The most common cause of an OBD scanner that won’t turn on is a blown fuse on the vehicle’s OBD socket power supply circuit. This has happened to me a ton of times and it’s never the scanner’s fault. But don’t panic, we’ll get this figured out. Plugging in your scanner and finding it doesn’t work is slightly alarming, some of these tools are expensive.
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