I have an unusual light on my dashboard. After a bit of research, I discovered that my Lexus has automatic headlight range control (which no longer corrects). I have studied several code readers and very few have advertised that they can decode headlight alignment errors. I bought this and without even opening the manual I was able to quickly diagnose that it was a bad sensor on the rear wheel. Looking around a bit, I found a severed wire in a secluded spot. Code readers and spare parts cost less than a trip to the workshop. The device paid for itself in one repair.
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