Does you car have the 272 or 273 Mercedes Benz motor in it? Well unfortunaely, you might be having some balance shaft issues on your car. Symptoms can range from no start to a check engine light. This is what the repair process looks like.
This is a side by side comparison
Can you spot the damage? Although this one is hard to tell, it is enough to cause problems on these engines. Usually a cam sensor code will be what triggers the check engine light but it is the loose chain that causes the problem.