redrose_45

1.6TDI Greenline has a rough idle. No codes or issues from VCDS, no codes from a snap on scanner tool either. Seems to drive fine when at temp and the lumpy sound is less. 119k on the clock Here is a video of it at various temps: https://www.youtube.com/shorts/60r8DnuL8gE Any ideas at all? I hear it can be the injectors, EGR, glow plugs, air filter, fuel filter, air intake system, the neighbour's cat... If there are no codes, what way could I or someone find out what's wrong? What live data would need to be recorded and checked? Side note: If it is the injectors, I heard the siemens ones that came with these have some factory fault where the insulation breaks down and causes issues. For replacements, which would I need to get in order to not have this problem in the future?

No lights on and since all the other emissions are in order it makes me think there's an exhaust leak. Will check those others thank you!:) South of UK.

I think they were being picky about the fuel cap o ring and headlights, the lambda sensor issue is understandable because that's tested with equipment that has no bias. I will give that a shot, i'll need to find someone with the equipment. Could it be some small exhaust blow that's causing it to read so high?

I have a feeling this MOT station was being picky for some of this stuff but what could be the cause of this and how would I fix it? 2004 1.2 12v Fabia Estate with 71k miles and a previously flawless MOT history.