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Bunker Hill, WV
Just under 60,000 miles , Maybe warranty? READ your EMISSIONS warranty booklet that came with the car , Certain emissions items are covered federally for at least 80,000 miles .
It's a WARNING that there is a PROBLEM with your HYBRID system. Possibly another hint may be that "it felt like I was losing power going uphill. It sputtered." Get it checked at a dealer OR a shop with the knowledge and equipment to FIX it.
any owners manual ?
Has it been on a lift to inspect for signs of leaks? Not all leaks show up on the driveway.
Find a shop that specializes in mercedes AND guarantees their work.
Did as shop do all that? IF not , get it to a shop that has a 'tech2' scanner , and get it DIAGNOSED before spending more money on wrong parts.
How long does it sit? oil level and type , correct? Check engine light on? If so , post code #s........ Fresh oil change with a quart of 'Marvel Mystery Oil' added in place of a quart of oil. Clogged converters ,may be causing restriction , not allowing revving over 4K. Check manifold vacuum at idle (from a port on engine side of throttle body).Post reading and if it drops down as the engine warms up.
Anyone watching under the hood , while your starting and trying to give it gas? Might HELP lead you in a direction.
see your other post.
Post results AFTER repairs are complete , so we know what difference it made. IF check engine light comes on after the repair , please post code # (not description), for further help.