Engine Fault

[XP3NNY]

So for some time, when the morning is cold, my car can run a bit rough for the first couple of hundred yards(happened a few times). Start and idle is fine, it's just when driving it feels like its going to die and yesterday morning it just died with following error message on iDrive. When started the car again it ran really smooth and everything seemed fine - no loss of power or other symptoms. Also this happens only in mornings with lower temperatures, during day etc is all fine. Carly scan is below - any idea guys?

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*** 494A:Glow plug, Diagnoserueckmeldung ***
Fault-Set 1 - ( 217440 km)

Activation period for the main injection 1: 156.25 us
Averaged value of the last three stored values ​​self-diagnosis by the NOx sensor upstream of the SCR: -399.99 %
Basic boost pressure setpoint value (low-pressure stage): 22016.00 hPa
Boost pressure plate - actual position of sensor characteristic: 19.22 %
corrected differential pressure (1 byte): 287.68 mbar
Current value of accelerator pedal signal 1: 390.62 mV
Exhaust gas temperature before catalytic converter - corrected value (1 byte): 449.22 degC
Exhaust gas temperature before catalytic converter: 73.53 degC
Exhaust gas temperature before particulate filter: 720.00 degC
HFM-shutdown: 55.00 -
Lambda value - measured from LSU: 0.10 -
linearized value of the fuel pressure sensor: 35.60 bar
maximum rail pressure of the last 10ms: 1890.20 bar
MoCSOP_stExtSM_mp 4: 5.00 -
MoCSOP_stMm_mp 0: 68.00 -
MoCSOP_stMm_mp 1: 64.00 -
MoFVSS_stFrzVSS: 209.00 -
Offset of particle filter differential pressure (1 byte): -85.10 hPa
Performance EKP (U * I) filtered: 0.00 W
Rail pressure - Setpoint: 611.76 bar
received neutral value for torque requirements from the drag torque control (MSR): 33.00 -
Setpoint of the reference angle for control beginning of the pilot 1: 15.37 degCrS
The measured from LSU lambda value 0: 3.12 -
voltage EKP: 17.10 V

*** 4C9F:Abgasrueckfuehrventil, plausibility ***
Fault-Set 1 - ( 217480 km)

Activation period for the main injection 1: 156.48 us
ambient pressure: 734.12 hPa
Averaged value of the last three stored values ​​self-diagnosis by the NOx sensor upstream of the SCR: -393.90 %
corrected differential pressure (1 byte): 151.78 mbar
Current value of accelerator pedal signal 1: 4531.25 mV
Exhaust gas temperature before catalytic converter - corrected value (1 byte): 322.55 degC
Exhaust gas temperature before catalytic converter: 164.12 degC
HFM-shutdown: 130.00 -
Lambda value - measured from LSU: 13.87 -
linearized value of the fuel pressure sensor: 3.30 bar
MoCSOP_ctErrMM_mp 1: 0.00 -
MoCSOP_ctErrMM_mp 1: 0.00 -
MoCSOP_ctErrMM_mp 1: 0.00 -
MoCSOP_stExtSM_mp 4: 8.00 -
MoCSOP_stMm_mp 0: 67.00 -
MoCSOP_stMm_mp 1: 68.00 -
MoFVSS_stFrzVSS: 0.00 -
Offset of particle filter differential pressure (1 byte): -63.92 hPa
Performance EKP (U * I) filtered: 0.00 W
Rail pressure - Setpoint: 258.82 bar
Ring memory with the last 8 Reset IDs 2: 0.00 -
Setpoint air mass (1 byte): 0.00 mg/Hub
Setpoint of the reference angle for control beginning of the pilot 1: 15.39 degCrS
The measured from LSU lambda value 0: 3.22 -

*** 4C9E:Abgasrueckfuehrventil, plausibility ***
Fault-Set 1 - ( 217480 km)

Activation period for the main injection 1: 156.48 us
ambient pressure: 734.12 hPa
Averaged value of the last three stored values ​​self-diagnosis by the NOx sensor upstream of the SCR: -396.11 %
corrected differential pressure (1 byte): 917.76 mbar
Current value of accelerator pedal signal 1: 58.59 mV
Exhaust gas temperature before catalytic converter - corrected value (1 byte): 322.55 degC
Exhaust gas temperature before catalytic converter: 155.88 degC
HFM-shutdown: 114.00 -
Lambda value - measured from LSU: 13.87 -
linearized value of the fuel pressure sensor: 3.30 bar
MoCSOP_ctErrMM_mp 1: 0.00 -
MoCSOP_ctErrMM_mp 1: 0.00 -
MoCSOP_ctErrMM_mp 1: 0.00 -
MoCSOP_stExtSM_mp 4: 7.00 -
MoCSOP_stMm_mp 0: 67.00 -
MoCSOP_stMm_mp 1: 68.00 -
MoFVSS_stFrzVSS: 0.00 -
Offset of particle filter differential pressure (1 byte): -63.92 hPa
Performance EKP (U * I) filtered: 0.00 W
Rail pressure - Setpoint: 274.51 bar
Ring memory with the last 8 Reset IDs 2: 0.00 -
Setpoint air mass (1 byte): 0.00 mg/Hub
Setpoint of the reference angle for control beginning of the pilot 1: 14.61 degCrS
The measured from LSU lambda value 0: 3.25 -

[AdamsX5]

What’s the Carly codes on the engine/motor.
Have you scanned in on ISTA-D?

[AdamsX5]

494A
This is combustion preheating control unit.
It could be your glow plug controller is playing up again but I would scan using ISTA-D.
I took my car to Doncaster and the seller sent it to specialist who had no problem fixing it. They charged seller around £400. They were more knowledgeable than the dealer who pissed around. Touchwood car works fine.

[XP3NNY]

What’s the Carly codes on the engine/motor.
Have you scanned in on ISTA-D?

The only other code I'm getting is Info on the DPF which is there due to high milage. Unfortunately I don't have anything else apart from Carly ... will have to book it into the garage

[AdamsX5]

Take it to a specialist as dealers will
Charge you 120 for a simple scan.

[XP3NNY]

So I went to my local garage on Saturday and their scanner show some error on EGR valve - however they said that they can't confirm and further diagnostic would be needed (or inspections).

I think I'm going to look into the EGR valve and see if it can be cleaned – anyone done this (not using the fuel additives but the actual EGR cleaning)?

Whilst I was there we chatted about DPF and cleaning of it. One of the technicians was saying that Ash mass and Soot mass is the same thing Now I’m pretty sure they are different as Ash is accumulated after Soot is burned during the regen – anyone can confirm this?

[Jase0851]

Egr cleaning it easy I cleaned mine (35d) and my previous 535d. Get some cleaner from halfrauds, it's 4 alen bolts holding the egr on and a circlip connector.