why does the left control unit that controls the left xenon light on my S500 keep needing to be replaced.It will work for a day or so after being replaced with a new one, and at 500 dollars a pop I can't keep replacing it.what could the problem be .Please help,I am going nuts.


second question,I get a bad shimmy at about 45 mph I changed the shocks, the steering damper ,the bearings,did a wheel alignment 4 times ,balanced the tires 4 times and it's still there.
what else could it be?

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outstanding