Cold start issue and exhaust smells - BMW 330d (2007 - 125,753 miles) - diagnostic and Carbon Clean

⭐⭐⭐⭐⭐ 'Adrian came on time and was professional from word go, showed me fault codes and live data and diagnosed issues straight away. Car is now running quieter and slightly smoother,
Couldn't recommend enough, Brilliant 👌'
🚗 BMW 330d (2007 - 125,753 miles)
🙋Reason for booking in...
'I've got poor cold start and smells abit like diesel while running, it's been to specialist but with no faults found I'm not sure that's the case'
🔎 Initial inspection found no obvious issues in the engine bay with no excessive rattles and shakes, but a tell tale rumble in the engine from the carbon present and an exhaust note not quite right with an excessive headache inducing smell.
📊 Initial code read found...
Plenty of error codes including glow plugs, fuel filter, smooth running controller, etc. All 6 glow plugs suggest the glow plug control/relay is the culprit of the cold start issues.
🔎 Live data is where things started getting interesting.
1 - DPF backpressure was FLATLINED at 8192mbar (healthy values are usually around 6-15mbar).
2 - DPF regeneration last occurred 56,072 miles ago
🗣️ After discussing with the owner it was clear that the DPF had been removed and remapped long ago. The likely original cause of the DPF issue is the glow plug system not working. The owner was unaware of this history from the seller and also the 'specialist' hadn't picked up on this.
🧑‍🔧 We continued with the clean and It soon smoothed out, quietened down and by the end it was quiet, smooth and responsive again.
❗ The owner can now decide what to do next regarding the glow plugs, DPF and smooth running issue.
🌐 f5e.cc/039133 👀
☑️ Full live data Diagnostics
☑️ Which? Trusted Traders approved Engine Carbon Clean
☑️ Safety first, fully insured and IMI Certified
#BMW #330d #WhichTOTM #whichtrustedtrader #IMICertified #prevention #Maintenance #servicing #diagnostics #Derbyshire #Leicestershire #Nottinghamshire #Northamptonshire #Rutland #Lincolnshire #MPG #performance #Engine #Carbon #Clean #Taxi #MOT #DPF #emissions #warranty

[@jj-tq4hx]

My 530D E60 has really strong white fumes from exhaust. Have to maintain my windows closed because can hardly breathe and eyes water. The color of the fumes are white to grey. Car runs brilliant with no loss of power.
Please give advice on what it could be.

[@aqib2000]

What was your root cause?