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Hey folks. Quick introduction as its my first post here! Been driving ****ty cars all my life, and got a sweet deal for a 2012 GLK 220 couple of years ago. I will never drive anything but a Mercedes now. Perfect for the rough northern winters and gravel roads in the summers.
I dont know too much about cars in general, so thought id give it a shot here with some proper folks. Ive got the codes P227962 - something manifoil/air intake leak. And P023714 - low turbo pressure/sensor.
Now for what I hope is the issue; cracked turbo pipe? As the performance have never dropped, idle is always smooth, and only when higher revs it gets noisy.
Its been slight squeeking with high revs for some time now, but I was told "ah, just change the manifoil and its fine". Drove a couple of months to save up some cash, as it wasnt too big of a deal. Suddenly now it got worse and the yellow engine light came on, and I got those codes out of it with a rookie ish device.
IF it turns out to be just a leaky pipe, is that dangerous to drive with as it runs smoothly and its just noisy? Beeing without car for a week aint easy where I live.
When idle its silent, starts at 1500+, and at 3000+ its quite bad now. Got a couple of clips attached for the noise. And a pic of my old gal, some beauty defects but no rust, and still smoooth driving!
Looking forward to any help possible
Cheers from the deep woods of Norway
Welcome! It sounds like you've got a boost leak, which explains the two trouble codes around "low boost" and the resulting check engine yellow light.
We don't have the 220 in the U.S., here it's labeled as a 250. In any case, if you have the 2.1L OM651 diesel, it's the same thing but with slightly different ECU programming.
I would suggest you drive the car up on ramps, remove the lower plastic shield under the engine and check the intercooler boost hose. You'll need to remove it to check it properly, all around its circumference. Just use a flathead screwdriver to pull the metal tabs out a couple cm from both ends of the boost pipe. That will enable you to pull/twist the pipe off from where it attaches. Once removed, clean it off well so you can see a clean surface and look around the whole thing for long cracks in the tube. You can gently squeeze the pipe to reveal any hairline cracks. If you have even one tear or crack in the pipe, it is sufficient to leak boost and cause underpower situations.
A new pipe is around $120 and should solve that issue. You may need an OBD scan tool to clear the code(s) and the check engine light, these can be bought only for under $100 as well.
Mercedes are nice cars to drive, but I would caution you that owning and maintaining one isn't exactly cheap, even when you can do most things yourself. Definitely don't skimp out on cheap parts or you will be doing that repair (whatever it was) again shortly.
Thanks a bunch for the tip! Will check it ASAP tomorrow! Yeah, noticed as much. Swapped some "regular" parts earlier on, and not cheap. Heard some horror stories from a bud whos owned a MB, but gosh damnit they are so nice to drive, haha. Makes it worth it in my opinion to spend a few extra bucks to keep it going
Here is some pictures of the hose than andreigbs is talking about. You can also have access to the hose by the top of the engine to feel the tear if you have small hands. Common problem on this engine but an easy fix.
THANKS A TON, fellas! That did the trick. Almost fell a tear when I stepped on the pedal and it was just the melody of the engine and no squeek, and full turbo juice. Great community!
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Squeeky noises at high revs
