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We did, nothing showing :-(
Cleaned the EGR valve as a matter of course

Could be injectors or a cam/crank sensor but that would usually throw a code.

I would reckon that limp mode would always throw a code, since the ECU chooses to go to limp mode (usually because a sensor provides no or improbable information).

Is the engine in limp mode or is it just running poorly?
Could be DPF regen, I've read on here some have poor idle when running regen.
I believe you can activate regen manually using MES, not sure though.
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