2009 Vito OM 646 reduced power mode

[Flexfer]

2009 W639 2.2 D OM 646
Hello everyone, my van has intermittently entered limp mode for the past year, but it has recently been occurring daily. Is it possible that the summer heat is a contributing factor? Powering off and then on resets the device.

A scan revealed the error "2526-004 StoredY77/1 (Boost pressure regulator) - Signal line is interrupted."
I have thus far inspected for air leaks, although it is challenging to detect them in that area. Verified that the actuator cycles upon van ignition, cleaned the connector, serviced the MAF, installed a new air filter, and replaced the crank sensor.
I apprehend disassembling the entire assembly and the wiring loom, which appears to be in pristine condition. I do not observe any areas where it may abrade or fracture the insulation.
Are there additional simple aspects I might verify initially?

[Flexfer]

High temperatures appear to exacerbate the issue, particularly while accelerating in an excessively low gear, prior to the gearbox functioning optimally.

[DMGRS]

Preliminary assessment?

Although the code does not indicate it, inspecting the EGR for unobstructed movement is not challenging.
Annual cleaning and soaking in Plusgas is prudent maintenance for these.


Regrettably, nothing apparent arises, since the turbo actuator is undergoing self-testing satisfactorily.

[Flexfer]

Indeed, I neglected to add that the EGR was my initial focus; nevertheless, I was unable to detach it despite employing many methods, including the allen key technique. I aimed to avoid damage, as I require the vehicle for daily work; hence, I opted to remove the plastic cover and clean what was accessible. However, that mechanism was operating without restriction.

[Flexfer]

Indeed, a smoke test is a prudent strategy.

[DMGRS]

I am unfamiliar with the allen key technique.
Is this rotating back and forth to loosen it?


I would apply Plusgas over several days of thermal cycles, then thereafter attempt to release it while the engine is heated.

[DMGRS]

For a preliminary assessment, I purchased an inexpensive device from eBay. It functioned effectively with the use of diesel.

It is a 12-volt heater/smoke generating unit, and I utilised my Ryobi tyre inflator to apply pressure.