I hear a rattle in the engine.
Engine rattles can come from a lot of things. Heat shields getting loose, plastic engine covers on top or below the engine, worn belt tensioners, etc. If it seems to have started after you had your vehicle worked on, an engine cover that was not clipped in all the way, which can easily happen, could be the problem. I would suggest having a professional mechanic, such as one form YourMechanic, inspect your rattling engine. If it is just a cover, they will be able to just clip it down and send you back on the road rattle-free.
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