Hi all, 

 

Thank you for your time, I'll try and keep this short.

 

My car: Skoda Yeti 2.0l 2010 Diesel French car (I live in France)

 

For quite some time now, I have had the following problems with my car

 

1. The Emissions Control System Warning Light always on

2. Very strong smell from exhaust

3 Fast petrol consumption

4. Intermittent black/grey smoke coming out the exhaust

 

I suspect this is linked to the VW software emissions fix I had some years back but it's too late for me to force Skoda to do anything about it. It could possibly just be an age thing.

 

My local garage tells me that this is a computer/re-tuning issue but they don't/won't touch that side of things. My local Skoda/VW garage has no interest in this kind of work and deter customers by charging €175 just to look at the car.

 

There is a re-tuning/remapping garage an hour away from me, but I know nothing about these services and whether they can fix this problem.

 

Can anyone here identify the cause of these problems and offer any advice on the best way to fix them? 

 

Thanks in advance

@jamiesandford

1. You have an EMS fault; you need to get the codes read, but at the Skoda stealer's price VCDS or OBD11 make economic ways of doing this!
2. You may have a fueling or oil fault. What does the exhaust smell of?
3. This looks like a fueling or possibly EMS fault.
4. And this like an oil or over-fueling fault, or possibly an oiled up catalyst and/or lambda probe.
5. Supplemental. Do you have heavy oil consumption?

It will only fix any problems the fix is causing if you get the fix removed/rolled back as if you get it remapped it will be the map off your car that is changed, still containing the fix.
There are places that can roll back the map to what was there and although a lot cheaper than remapping there are not many places that do it and certainly no Skoda dealerships.

Hey Ken,

1. You have an EMS fault; you need to get the codes read, but at the Skoda stealer's price VCDS or OBD11 make economic ways of doing this!

I agree I definitely have an EMS fault, how are these fixed and by who? 

 

Can you explain a bit more what you mean by "you need to get the codes read, but at the Skoda stealer's price VCDS or OBD11 make economic ways of doing this!"

1. You may have a fueling or oil fault. What does the exhaust smell of?

Petrol I would say

1. This looks like a fueling or possibly EMS fault.
2. And this like an oil or over-fueling fault, or possibly an oiled up catalyst and/or lambda probe.
3. Supplemental. Do you have heavy oil consumption?

No I don't have heavy oil consumption

 

It will only fix any problems the fix is causing if you get the fix removed/rolled back as if you get it remapped it will be the map off your car that is changed, still containing the fix.
There are places that can roll back the map to what was there and although a lot cheaper than remapping there are not many places that do it and certainly no Skoda dealerships.

 

Thanks Urrell...yes I think finding a place that will roll back my map in France is going to be tough. Are you saying though that there's no way to correct these faults without a roll back? That seems depressing

10 minutes ago, jamiesandford said:

1. You may have a fueling or oil fault. What does the exhaust smell of?

Petrol I would say

You said earlier your vehicle was diesel powered which would correspond with the emissions fix, did you mean to say the exhaust smells of carburant rather than petrol?

 

I have VCDS and live in France, I am in Bergerac but travel frequently to Picardie.

11 minutes ago, jamiesandford said:

Are you saying though that there's no way to correct these faults without a roll back? That seems depressing

You do not know what the fault is without reading the fault codes, that is the first step, any competant garagiste should have a multi-marque fault code reader, even a basic generic OBDII reader will give all emissions relate codes.

did you mean to say the exhaust smells of carburant rather than petrol?

 

Yes, JR I did.

 

You do not know what the fault is without reading the fault codes, that is the first step, any competant garagiste should have a multi-marque fault code reader, even a basic generic OBDII reader will give all emissions relate codes.

 

Okay, I understand now...okay I will return to my garage and get the codes...that said my garage has definitely seen the codes already and have not been able to fix the problem.

 

 

Okay the error codes are

 

5286

P0121100 (throttle sensor)

 

To be clear my mechanic has (as recommended) cleaned the system more than once but the error code never goes away (24 hours maybe but no more)

 

 

You might find this helpful.  https://www.vwaudiforum.co.uk/forum/showthread.php/188650-Fault-code-5286-likely-fix

 

Bon chance....👍

6 minutes ago, Schtum said:

You might find this helpful.  https://www.vwaudiforum.co.uk/forum/showthread.php/188650-Fault-code-5286-likely-fix

 

Bon chance....👍

I very much appreciate the reply Schtum but cleaning everything up doesn't really address the problem at all... yes, I can and do get the soot and carbon cleaned out periodically, but the rate at which it is building up is way beyond what is normal. My garage will do the clean but 24 hours later the warning light is back on and the smelly and smoky exhaust continues

 

I think that something is wrong with the EMS and the car is burning way too much fuel too quickly and creating much more soot etc than a correctly regulated engine would. 

1 hour ago, jamiesandford said:

Okay the error codes are

 

5286

P0121100 (throttle sensor)

 

To be clear my mechanic has (as recommended) cleaned the system more than once but the error code never goes away (24 hours maybe but no more)

 

 

Because he's not fixing the throttle sensor fault I suspect. That said I don't recognise the code, so can't consult a wiki to find out what it relates to.

3 hours ago, jamiesandford said:

I very much appreciate the reply Schtum but cleaning everything up doesn't really address the problem at all... yes, I can and do get the soot and carbon cleaned out periodically, but the rate at which it is building up is way beyond what is normal. My garage will do the clean but 24 hours later the warning light is back on and the smelly and smoky exhaust continues

 

I think that something is wrong with the EMS and the car is burning way too much fuel too quickly and creating much more soot etc than a correctly regulated engine would. 

 

Have you seen pics of the ASV / throttle body before and after cleaning?  

Quote

Have you seen pics of the ASV / throttle body before and after cleaning?  

 

I sure have and here are the pictures! 

 

 

 

What I'm trying to get a cross is that after I have everything cleaned out the Emissions Control System Warning Light comes back on 24 hours later. The exhaust continues to smell terrible, the intermittent smoke out of the exhaust returns and within 4 to 6 months I need everything cleaned again...It can't be normal that the soot and carbon is building up that quickly.

 

 

 

 

 

 

It looks like you could well have a leaking Injector.

Supplying way too much fuel all the time.

Get yourself to a Diesel specialist.

Nothing to do with the injector, the throttle valve is upstream, all it passes is filtered air and EGR, far too much of the latter by the look of things.

 

The EGR port needs it's direction reversed away from the throttle valve, the butterfly may be sticking or the potentiometer gears broken, the EGR could be open all the time but that should generate its own fault code.

 

I think the solution will be cleaning and replacing if necessary the throttle valve and the fitting of an EGR emulator and blocking of the port, the latter cannot be carried out without the former.

I would whip out and examine the o2 sensor, mine was utterly blocked and playing hell with the fuelling, mpg is now mid 40's up from low mid 30's. 

The only thing that can be clogging the throttle body is excessive EGR gases, a rich mixture is injected downstream in the cylinders.

 

Definitely something to check though but once again it should bring up a fault code, I'm not convinced the garage has something equivalent to VCDS but any emissions related codes like an O2 sensor should be displayed on a basic generic OBDII reader.

 

My money is on an EGR valve problem, perhaps not seating but the position sensor giving the correct reading, or there is a fault code that the garage has not seen or divulged.

 

The definitive solution that does not involve hours of labour and expensive EGR replacement is a £99 EGR emulator and a blanking plate if gases are getting through when it is supposed to be in the closed position.

3 minutes ago, J.R. said:

The definitive solution that does not involve hours of labour and expensive EGR replacement is a £99 EGR emulator and a blanking plate if gases are getting through when it is supposed to be in the closed position.

 

I believe that deleting the EGR doesn't do the DPF any favours.   https://www.darksidedevelopments.co.uk/diesel-particulate-filter-dpf-fap/

You should question your beliefs and not accept everything as gospel.

 

No basis for their claims, EGR is suspended while DPF regeneration takes place.

 

If you think about it logically this statement is laughable:

 

If the EGR is not working effectively or blocked the amount of exhaust gases passing through the DPF will be increased potentially speeding up the DPF blocking.

 

The volume of gases passed through the exhaust is a constant, some might take a few milliseconds longer by having done a second circuit of the cylinder but what goes in goes out!

 

I have done 40k miles with no EGR, these vehicles ran very well with limited EGR and regenerations before the "emissions fix", that is when all the problems started with much increased EGR and regen frequency.

 

My throttle valve will be as clean as the day I declagged it 40K miles ago, only filtered air has passed over it since then. My DPF is in good health as well although it's time for another check, a real world backpressure test and not some fantasy calculated ash loading. I paid to have the emissions fix rolled back, I cant think of the last time I was aware of a regen in progress or heard the engine fans running after switch off indicating a failed regen, it used to happen all the time & I would have to go on a longer journey just to allow the regen that was not needed (measured soot below 10g) but commanded all the same, then 125kms later the same deal all over again, it was even regenning at the end of an 800km autoroute journey towing a huge overloaded trailer with wide open throttle a lot of the time.

Edited 3 February, 20233 yr by J.R.

28 minutes ago, J.R. said:

You should question your beliefs and not accept everything as gospel.

 

Teach your granny to suck eggs, J.R.   I've followed Darkside's thinking on this over a number of years.  They've gone from thinking as you do, to their current position on the basis of performing work on countless diesels. 

Their ridiculous comment quoted above does not do them any justice in which case.

 

Do you consider it to be plausible? If so what am I missing?

36 minutes ago, J.R. said:

Their ridiculous comment quoted above does not do them any justice in which case.

 

Do you consider it to be plausible? If so what am I missing?

 

I think it's logical that if the EGR isn't present and working then a greater amount of soot is going to pass into the DPF.  

 

This is the explanation which I've always considered to be logical....

 

Diesel high pressure EGR valves divert the high-flow, high-soot exhaust gas before it enters the diesel particulate filter – the soot can combine with the oil vapor to create sludge. The gas is then passed back to the inlet manifold either via a pipe or internal drillings in the cylinder head.  A secondary valve is also used to help create a vacuum in the inlet manifold as this is not naturally present on diesel engines.

 

https://www.delphiautoparts.com/gbr/en/resource-center/basics-egrs-what-they-do-how-they-work-how-troubleshoot 

What oil vapour is present between the EGR and the intake tract?