After so long having new bits replaced, 6 weeks of no problems apart from battery light coming on 5 minutes of driving, light fault that now is solved. I thought the car was at long last fixed til white blue smoke bellowing now

What is a known fix? To pinpoint actual issue! Tech2 shows no issues so not electrical related problem, egr valve is spot on. So what else???

Hope someone who had the bluefish smoke can help what was done to fix it etc so I can cross out the area and narrow it down further.