Kev555

Thanks very much Steve I will give it a go😁 130k on mine so its at deaths door. I stuck a can of liqui moly purge cleaner into about half a tank at the start of the week. Hardly likely that has shifted the EGR?

Thanks Steve I will have a look on eBay for the delete kit for the swirl valves. I'm thinking that the EGR now seems to be closed as theres no smoke this last couple of days with the MAF plugged back in. I'm wondering was the MAF holding it open a bit or did the unplugging of the MAF force it closed if it was gummed up? I cant confirm or know this is what happened for at least a couple of weeks to see if the problem arises again. Just a bit baffled that the issue is sorted ATM. I haven't even looked where the EGR is located and if its accessible for on car cleaning or freeing up. Thanks for you help so far Steve it was a big relief to find injectors are not at fault so far.

Thanks Steve If I cant cure it handy I might get it mapped out of the system especially when they have swirl flaps too from what I understand( have the same ballicks issue with swirl flaps on my Merc Vito). I will try unplugging the EGR when the smoke issue arises again. Plugged the MAF back in yesterday as wife was driving it today. she said no smoke today although she might not always be paying attention while on a shopping trip😁 I was overthinking this morning as usual and bear with me Steve to I get the basics hammered into my brain of what the car does while the MAF is unplugged. Is the EGR valve fully closed? i.e. reason for no smoke? and does the car just use a basic map with no or little emission equipment functioning?

Thanks Steve, a bit of a pin in my balloon but thanks for your input. Good to know before I buy a new MAF. I will go back tomorrow and try my laptop. Its got Wurth and Delphi which is pretty good software. I was picking up more codes with Wurth than anything else but there was no faults or codes from the EGR. I seemed to be able to open close it via the software at tick over as the engine note changed but suppose I cant verify that its closing fully? Good to know the DPF is still operating as it should. Back to the drawing board again. Can you blank the EGR pipe in these handy without causing other issues or is it a software delete? I will try to get VCDS software.

Unplugged the MAF this morning as Steve suggested this could also be at fault and went for a 30 mile round trip. No smoking whatsoever at standstill during the journey. Should I order an MAF or would it not stop smoking anyways with the MAF unplugged even if it wasn't at fault? The temperature sensor seems to be behaving normally in diagnostics data and DPF doesn't seem to be the issue although cant be 100% sure. Could any Techs or forum members help me confirm the MAF, sorry if the info I posted so far isn't enough.

Managed to get a stationary DPF regen done today with another laptop. Ran for half an hour and medium diesel smoke the whole time during the regen similar to what it does when coming to a stop after a run. DPF is showing zero soot and info is a bit off from it. I'm wondering has it been doctored?

Finally got round to looking at the A6. I went through all the live data and could not find any tell tale signs from sensors etc. I dumped a can of purge cleaner in the tank for a few days to see how that goes. After test driving it yesterday I find that once the A6 is at normal temperature and after every lets say 5 mile run it smokes at standstill for about 1-2 mins then clears and is fine after that until you go for a run again. I'm thinking DPF issues at this point and next step i suppose is doing a regen. I tried a stationary regen with my icarsoft but just seem to get errors as if I'm not meeting the criteria correctly? Temperature on the 02 sensors seems to be reading ok but some data from the DPF seems to be missing making me think its possibly been mapped out of the system if thats possible? or my icarsoft pro isn't fully compatible with the ECU. Any thoughts out there or should i just continue to suspect DPF?

Thanks Gareth might try that until the problem comes back.

Thanks Steve i did a diagnostic check a while back as ive a icarsoft cr pro, nothing came up obvious at the time in the fault codes, just a few historic minor ones. I guess I will have to try at get a look at live data when the problem arises. Never thought of the Maf, it has a temp probe too so could be that. thanks

Hi all my first post here since joining a couple of months ago. I have a 2013 A6 C7 3.0 TDI. Occasionally when the car stops in traffic it starts putting out excess smoke which stinks of diesel. I thought about the injector issue which I heard was in earlier models? but its too intermittent for an injector I think as I can drive around long and short journeys for a week and no issues and then it arises on a short trip and its gone the next morning? I'm thinking faulty temp sensor or EGR? Any techs or forum users come across this before. help narrowing this down appreciated to speed up diagnosis.

Thanks Steve, I will look them up

If its flushed 3 times and improving the only thing I would recommend is a gentle detergent. I have done it myself in the past with dishwasher tablet dissolved and poured into the matrix left overnight. Another one a friend of mine tried who's a plumber by trade was central heating flush overnight. last resort is caustic soda for 5 mins tops if you've nothing to lose but all these run a risk if you heater matrix is rotten or pinholes in it the debris blocking it is only thing preventing it leaking.

Thanks Steve, Does the door card have to come off? cant see myself ATM as wife has stolen it this morn for work.

Thats where the problem lies as 3 garages surely cant all be wrong. sometimes not enough hot water travels through the matrix to heat the car properly. and sometimes a blocked matrix looks as if hot water is flowing through it. Did any of the garages try flushing the Matrix or actually checking the flow rate through it? It can be a delicate operation on some cars as too much water pressure can bust the matrix.

First decent drive in A6 today, 60 mile round trip all went well, like sitting in an armchair😊. Only fault I've found so far apart from noticing air con needing recharged on the test drive is the passanger side back door electric window button doesn't appear to be working? The other side is ok and window goes down from driver's door controls.

Thanks Steve glad to hear its just normal wear and tear bits I will need to watch for. I was just a bit concerned with the high mileage

Hi all, just joined today as I'm the new owner of a 2013 A6 3.0 S line. Its a high miler with 128K so just wondering if theres any issues in particular i should be looking out for? The car drives like new for the miles and has a full service history between main dealer and independent.