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karlstorm9

S Klasse Hybrid Engine Problems

My 2023 Mercedes S Klasse hybrid is giving me fits. Only 6163 km on the clock and the engine won't start sometimes, stalls at idle, check engine light is on, runs rough, and drinks fuel like crazy. Error memory suggests a fuel pump issue. Could it be a dodgy connector?

Summary of the thread

A 2023 Mercedes S Klasse hybrid is experiencing engine problems, including failure to start, stalling at idle, rough running, and excessive fuel consumption, with a check engine light on. The error memory indicates a potential fuel pump issue, possibly due to a faulty connector. After considering various causes, including the fuel injector relay, the problem is resolved by fixing a bad connection to the fuel pump, costing 95€.

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4 comment(s)

hanslorenz1

Fuel pump failure on a new S Klasse? That's rough. I had similar symptoms on mine (not the hybrid though). Engine stalling, rough running... you name it. Did you check the fuel injector relay? Have you done any automotive diagnosis on the gasoline delivery system yourself yet?

karlstorm9 (community.author)

Fuel injector relay? I hadn't considered that. Where is that located and how would I test it? Is there anything else it could be before I start ripping things apart?

hanslorenz1

The relay location should be in your owner's manual, or easily found online. But honestly, with those symptoms and a stored fuel pump error, especially on a hybrid, are you sure you want to mess with it? The high voltage system adds a layer of complexity. Consider having a workshop take a look. In my case, the pump was gone.

karlstorm9 (community.author)

Thanks, I appreciate the insight. Ended up taking it to the shop as you suggested. Turns out it was indeed a bad connection to the fuel pump, just like I suspected. Cost me 95€ to fix. Thanks again!

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MERCEDES

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SKLASSE