hermannwolf60
Mercedes C Klasse diesel oil pressure problem
Summary of the thread
A 2021 Mercedes C Klasse diesel with 190,646 km is experiencing an oil pressure warning light and loud mechanical noises. The initial suspicion is a faulty oil pump, but other possibilities include a bad oil pressure sensor or a major oil leak, despite no visible leaks. To diagnose the issue, checking the oil viscosity and obtaining an oil pressure gauge reading are suggested. Ultimately, a mechanic confirmed a defective oil pump, which was repaired, resolving the issue.
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4 comment(s)
hermannwolf60 (community.author)
The oil level is fine, so that's not it. I'm worried about damage if I keep driving. Was your car's behavior the same, and what did you do to fix it?
hannes_schubert1
Yeah, pretty much the same thing happened to me. I didn't want to risk anything, so I just took it straight to a workshop. They ran some tests and figured out it was the oil pump. Best to get it checked out by professionals before something really bad happens. I think they can hook up an oil pressure gauge to see what's really going on.
hermannwolf60 (community.author)
I took your advice and had a mechanic inspect it. They confirmed a defective oil pump, just like I thought. The repair, parts and labor included, cost 755€. Now the oil pressure is normal, and the engine noises are gone.
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MERCEDES
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CKLASSE
hannes_schubert1
Whoa, that sounds rough! I had a similar issue with my Mercedes C Klasse, though I can't remember the exact year. The oil pressure light came on, and the engine was making some pretty scary noises. I was worried it was the engine bearings going bad, but I didn't see any oil leakage either. Did you check the oil level? Maybe it's just low? Is the oil viscosity normal?