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If it feels like a rod that broke then yes that is a very costly repair. It might be just a broken valve spring. If you feel it around the valve cover then it might be this. If it is then it would be let expensive. What could cause this could be a few different things. First is the lack of oil. Sometimes something may restrict oil flow and this might cause it. Second could be just wear and tear over time. I realize you dont have many miles but I have seen parts do bad like this before. You could remove the valve cover and take a look and this would give you come idea. Please let me know what you find and good luck
2003 Jetta left rear window blue plastic part of the