This was so easy 😮 I just had to plug the device into this slot underneath my steering wheel. I didn't even realize that slot existed... but I guess it's what mechanics use to diagnose your car. This lets you see what's wrong with just your smartphone! My check engine light ended up just being a faulty spark-plug, which is only an $8 item to get replaced. That's a far cry from what the mechanic wanted to get to fix the issue. | Top Tech Shifts