21P2090008 recalls OM656 and OM654.

[blaisecj]

It has been mentioned in other threads, but my E400d 4Matic S213 standard waggon has been experiencing problems with the turbo boost. It has been determined that the problem is caused by coolant crystals in the vacuum lines and actuators of the turbo actuator.

Can you tell me where this coolant is made? Don't quote me on this, but it seems like there's a vacuum line going to the coolant pump that limits the circulation of coolant when it's not needed, much like a stat. The pump is leaking coolant into the vacuum system, which is a major issue.

From what I can tell, this can lead to a number of problems:
1. The problem I'm having is that when coolant crystals accumulate in the turbo vacuum lines, it causes a loss of boost and puts the engine into limp mode. This is exciting when you're trying to overtake but your torque drops from 700 Nm to 70 Nm.
Brake boosters seem to be susceptible to the same problem, which results in the loss of servo assist.
3. In the worst-case scenario, the coolant could even spark a fire by shorting out the wiring of a vacuum circuit switch.

Fixing the pump leak isn't what this shoddy Mercedes fix is all about. I take it that they're not actually removing vacuum from the pump; rather, they're just updating the software and switching the switch to make the pump run continuously. However, the issue of coolant and crystals in the hoover plumbing remains unresolved despite all of that.

In addition, the recall does not apply to my vehicle, even though it is in the same year as 656 of the affected engines (2019). So far, MB has avoided answering my question about why not. I have also checked with the DVSA.

Have any of you had the recall serviced? Tell me which car it is, what year it is, and what kind of engine it has.

[leifjx]

Would you call this a DVSA-mandated recall or a Mercedes product recall?

The DVSA will stay out of it if the second scenario plays out because, in their experience, they are only concerned with matters of safety.

Companies reach out to drivers through government databases.

[blaisecj]

As far as I can tell, it's a recall due to safety concerns (fire hazard and brake failure).
My VIN is not on either the DVSA database nor MB's database, even though my specialist searched both.

[leifjx]

Wow, that's strange. I take it this vehicle isn't imported, right?

[blaisecj]

The whole service record originates from the UK, so the answer is no.
I'm curious if anyone has had it done or is similarly excluded, which is why I'm posting here.
A video from Germany featuring a man who experienced this recall four years ago can be found on YouTube.

[tarquinrr]

I hope that works out. Mercedes-Benz issued a safety recall (code P117) for all vehicles manufactured between a specific date range that had the OM642 V6 CDI engine. These had a faulty crankshaft position sensor installed, which could suddenly stop the engine with no warning. But the W639 Vito/Viano wasn't part of this recall in the UK. After my V6 Vito's CPS was activated, MB's response was straightforward: the W639 wasn't recalled because it wasn't necessary. Although (a) they were obviously impacted and (b) they were part of the recall in other nations. I've owned this vehicle from the day it was new—it has 62,000 miles on the odometer—and MB still won't even make a goodwill contribution.

[blaisecj]

According to the experts I consult, when it comes to recalls, MB and BMW couldn't be more different. They do a plethora of recalls and updates for BMW, but for MB, there are hardly any. It is my intention to return to an S212 when I exchange this S213. My present 400-mile treks will not be continued.