2012 Lexus IS 250 timing belt or chain
Your car has a timing chain. Timing belts have a replacement schedule. Chains are designed to last the life of the engine unless there another fault, like a tensioner, guide, or sprocket, that causes the need to replace the chain.
I'm at a loss what the problem can be. I was driving home late yesterday and about 2 miles from my house it sounded like a plane engine and kept up until I shut off the car. I will go to the mechanic on Monday which is about 10 miles from home. Would it be safe to drive or should I have it towed?
As you were able to drive the car two miles, I doubt that it has anything to do with engine mechanics. If noise is the only symptom, it might just be an opening in the exhaust. Start it tomorrow and if it runs OK, drive it; but watch out for police.
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