Hello, I bought a used VW Jetta 2000 VR6 GLS Yesterday from a dealer (not VW). Though I have heard a slight noise (so't of bearing screeching) I took the dealers word to be usual for a car with 140000 miles on it. But after driving it for about 300 miles the noise has become really loud & audible from outside without the hood open. I am wondering if this is something serious. Check Engine Light also turned on now and wouldn't go off. Is it something to do with timing chain or bearings for one of the belt pulleys gone bad? I can return the car immediately if this is something major. I would appreciate if someone can let me know.
Thanks.

 

Mine did that at about 80,000 miles. It was the belt tensioner, the bearing seized, first the engine light, then EVERYTHING else, power steering went, everything. Cost me almost $300 to replace, so that's my story.

 

I would check the oil and then take it back to the dealer