Hi Members, I'm Brad from Durham in the UK and look forward to learning more from members experiences with Mercedes.

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BradMBZ

New Member
Joined
Sep 12, 2023
Messages
5
Location
Durham
Car
2014 SLK AMG 250CDi R172, 2016 E220D Coupe
Hi Members, I'm Brad from Durham in the UK and look forward to learning more from members experiences with Mercedes.

In fact, I would love to hear of any experiences and or advice you may have with this issue on my
2014 SLK R172 250cdi AMG.

Limp mode with engine light sometimes on a morning after travelling a mile or so. Park up for a couple of hours and the light will remain on but will disappear after a longer period or overnight. Car performs normally after stopping engine when engine is up to temperature and restarted even though engine light is still on.

(Its like - If i start the car on a morning from cold and drive very carefully (keep revs/acceleration limited) until warmed up and then ask for power then Limp mode/engine light will not come on. - Could this point to a system leak, leading to lack of vacuum or blocked pipe stopping a vacuum occurring)

2 Fault Codes reported at recent service (46k Miles) P029900 & P00AF72 with some advise that Turbo will need replacing etc.

I have done some reading and so far faults point towards Boost Pressure Sensor or Turbo Boost Pressure Transducer Valve or Turbo itself (blades/Waste Gate/Diaphragm Valve) . I have changed Transducer Valve and this has not fixed the issue.

There are two Sensors that I can see which are a little confusing because sometimes they say they are the same. I have pictures of both (attached).
  • On Air Intake
    • DC (light green text on silver)
    • A 006 153 97 2B.
    • 14-03-15 2D 21.
    • 0 261 230 190
  • Close to Transducer Valve
    • Bosch (white text on black)
    • 2111 08 T1 20623B
    • 0 261 230 439
Everything else on the car seems fine apart from occasional smell of oil.

Any help would be fantastic, Thanks
 

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