It worked for a couple of months then failed. First it gave a report that my alternator had a problem. I took the car in, no problem with the alternator. Continued to get the same report. Took it to another mechanic, no problem. Suddenly this weekend I started getting multiple trouble lights coming on and cycling through along with my turn signals freezing briefly. I took it into my mechanic again this morning and this time he said it was most likely the Hum interfering with the car's computer system as they had been getting numerous reports of this kind of problem with it. He took it out for me and I've had no problems since then. I am hoping Verizon will not give me a problem dropping the contract for it but I need to know if a trouble light comes on it is genuinely a problem. I also can't afford to have false reports given. I am lucky my mechanic is honest as an alternator repair is rather expensive.
Bottom Line: No, I would not recommend this to a friend
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