rainermoon1
E Klasse Hybrid Issues
Summary of the thread
A 2020 Mercedes E Klasse hybrid with 264,999 km was experiencing higher fuel consumption, reduced engine power, stalling when idling, and black smoke during acceleration. The suspected cause was a faulty injection system, possibly due to a defective cable or plug connection. After taking the car to a workshop, it was confirmed that a defective plug connection in the injection system was the issue, and the problem was resolved after repair.
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4 comment(s)
rainermoon1 (community.author)
I haven't scanned for error codes yet, as I don't have the equipment. Regarding the smoke, it's black and quite thick, especially when accelerating hard. Could this still be related to the fuel injection, even without a visible petrol leak?
christopherloewe69
Black smoke typically indicates an over-fuelling condition, strongly suggesting the injection system is at fault. While a visible leak is always a concern, the issue could stem from faulty injectors delivering too much fuel, or perhaps an issue with the sensors that control the fuel-air mixture. Think of it like a tap that's stuck open. A diagnostic scan would pinpoint the exact component at fault. I would recommend taking it to a qualified workshop for diagnosis.
rainermoon1 (community.author)
I took it to a workshop as you suggested, and they confirmed it was a defective plug connection in the injection system, as suspected. Repair cost was 95€. Everything seems to be working fine now.
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MERCEDES
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EKLASSE
christopherloewe69
I have experience with a similar issue on an E Klasse. The symptoms you describe align with a potential fault in the injection system. The increased fuel consumption, reduced performance, stalling, and smoke all point to an improper fuel-air mixture. Have you had the Engine system scanned for any error codes? Also, can you describe the colour and density of the smoke?