I,ve just covered approx 3000 miles in my June 2010 reg car and have only today discovered the mystery behind why my speedo varies dramatically and drops to zero intermittently whilst driving. The fault has been discovered by the Hyundai dealer to be to do with the connection of the hands free Parrot Blue tooth phone kit - so whenever my phone is in use the speedo goes to zero. Question? would this be considered in my defence if I was caught speeding whilst the phone was in use and I could not read my exact speed.?
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