mara_ice5
Check Engine Light and Rough Idle on R Klasse
Summary of the thread
A 2015 R Klasse with a gasoline engine is experiencing a check engine light and rough idle, with additional symptoms of jerking during acceleration. The issue is suspected to be related to the fuel system, specifically the fuel pressure sensor or possibly a faulty cable or plug connection. The problem was resolved by addressing a dodgy cable in the fuel pressure sensor, confirming the initial suspicion.
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4 comment(s)
mara_ice5 (community.author)
Yeah, it jerks a bit when accelerating too. You think it's definitely the fuel system? Anything specific I should be looking for?
matteosteel1
Well, it was the fuel pressure sensor in my case. Could be a faulty cable or a bad plug connection. I’m not a mechanic, so I'd recommend taking it to a workshop to be sure. Better safe than sorry, especially with the engine misfire.
mara_ice5 (community.author)
Thanks for the heads up. Took it to the shop, and you were right. Fuel pressure sensor. Cable was dodgy. Cost 95€. All good now.
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MERCEDES
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RKLASSE
matteosteel1
I had something similar on my R Klasse. Check engine light, rough running, stalling at idle. Does it also jerk when accelerating? I'd check the fuel system, maybe the fuel injector. Have you looked at the fuel pump or considered it could be related to fuel economy issues?