W205 DPF and low boost on turbo 1 fault codes

[Pinhead444]

Hi all,

my C250 bluetec sport with adblue delete has gone into a strange limp mode where it won’t go past 3000 RPM but doesn’t limit speed or even come up with a limp mode warning.

Power is very low from 1000RPM to 2000 and then increase when past 2000.

I took it to a garage who smoke tested it to which there was no leaks but seems like the smoke wasn’t getting past through the exhaust - possibly being a block in the DPF he suggest but couldn’t be sure.

Could a blocked DPF cause low boost on turbo one or could this be something else?
I’ve heard it could be the EGR, vacuum pump, sensors and obviously turbo but it drives somewhat fine.

Thanks for any help that can be provided

Pic of codes attached, P246309 and P029900

 

[OneForTheRoad]

An icarsoft scanner would tell you the last time the dpf did a regen. Some ad blue delete files were stopping the dpf from working properly and were re written .

 

[pcthrillrider2]

it will be in limp mode with P2463 code means the dpf pressure is above 400% i dont think adblue has anything to do with dpf regen

 

[sautah]

At 400% reported fill level the car will go into limp mode and have an eml light. Your auto box won’t work correctly and you’ll think it’s the gear box at fault. It isn’t.

I’ve had this as reported on a previous post and my own problem was the 12v voltage being low. I have an autel scanner that tells me the last time the car regenerates and whether successful or failed. If it fails it reports the reason. Saved myself £700 quoted by a so called specialist who wanted to remove and clean the DPF and swap some other stuff.

New 12v AGM battery fitted and back to normal.

From my experience with the 651 the following are the main culprits for limp mode / lack of regen:

DPF pressure sensor (under airbox).
Exhaust pressure sensor (back of engine passenger side on uk car ).
12v battery.

Diagnostics will reveal l all for you hopefully