The store couldn't figure out why my check engine light was on and it was intermittent. Apparently the machine didn't keep any records of it either. I bought this and kept it in my center console - when the light came on I plugged it in and it told me the error. Best of all, the error persists even when the plug is unplugged, so even after the engine light went out, the store knew what the problem was that needed fixing. It costs money!
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