Hi All,

 

Have a 64 plate Octavia 1.6tdi...done 12900miles and recently its regenning on a daily basis..

 

Its getting plenty of long runs...retunring 55-60mpg all day long

 

do you think its correct? No lights on touch wood.

Doesn't matter if it is getting long runs if the exhaust doesn't get up to temp for a regen to complete.

 

Try driving in 4th or 5th at about 2250rpm to get the DPF nice and hot.

 

Could also be your fuel - have you filled up with anything different lately?

Does this mean more Regens in the winter?

Not necessarily.

 

It will regen based on a mileage interval or soot loading.

 

If the regen doesn't complete it will keep trying. The usual cause for it not completing is the DPF not getting hot enough. Long cruises on the motorway do not get a DPF hot enough normally as you are at fairly low revs (below 2000) and there is plenty of cool airflow.

 

You need to be at a lower speed and higher revs if you keep interrupting regens.

 

I didn't have an issue last winter, and haven't so far this winter.

I have just rolled over to 13,000 miles (but mine is a little older on a 14 plate), and it certainly doesn't regen daily. I would say I could count on one hand the number of times I have stopped a regen at the end of a journey, and about the same number again of regens I have noticed while driving. My commute is 15 miles each way (on A/B roads).

 

I am averaging about 51-52 mpg so you could say I am driving it carefully, I will try and keep the revs below about 2000 if I can. Use Shell Fuelsaver too. The winter hasn't caused any obvious issues either.

I did 20k in my first O3 and interrupted maybe 5 regens at the most. I didn't notice many regens when driving either. Always use Shell Fuelsave with the occasional tank of supermarket craps diesel.

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How do you know it is attempting a regen?

An increased RPM is no longer only attributable to a regen.

In colder temperatures the later CR engines have started raising the idle to 1,000 RPM to maintain a steady engine temperature.

Fuel economy takes a dive, start stop is disabled, you can sometimes smell it and the front mounted wind turbines kick in to overdrive

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And the reason given for start stop being disabled is the self explanatory 'Engine must be running' message or whatever it is

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And the reason given for start stop being disabled is the self explanatory 'Engine must be running' message or whatever it is

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The "engine must be running"status also relates to other stuff like engine load. Quite often my start/stop will be available but then gets disabled if I put on heated screens or seats. It doesn't necessarily mean a regen is in progress.

Post meant more of an addendum than a correction, if you know what I mean.

I've done 39k miles now, mainly on motorway, and notice regens at least 3-4 times per week, usually notice it on the slip road when exiting the motorway if stopped at lights. Not had any warning lights so guess it's just doing its thing to keep everything nice and clean. As Andy says, most motorway trips are running less than 2000 rpm, and with all the 50mph road works, its only just ticking over most of the time when left in top gear!

Mine does it at least once a week but never had a warning light either. It does get some funny looks from passers by and they give it a wide berth...I don't think people expect that much row from a newish car.

The car will run 3-4 days without anything happening,it's driven keenly and mainly in 4th gear due to the 50mph roads where I live,

 

I'll be driving about and you pull up to a junction and its revving at 1000rpm, you can smell it, mpg takes a hit and its seems to sort itself out..you come home later when its stopped

and I have a jumbo on the drive waiting to take off,

 

It goes through this for a couple of days then nothing...recently we had it 2 mornings on the run...also when starting from cold it sounds like theres water being swirled round a can(best way I can describe it) for a few minutes...its fairly loud and never did it when we got it....any ideas

 

Fuel wise its whatevers nearest when I need it, Its a  lease car which is going back after 13k..so they say not heared anything of them collecting it so many be staying?? so not long term only run up the mileage then it goes back to skoda and we get something else...

 

Interested to know on the above points in general rearly.

 

many thanks

Back in 2010 I bought a Seat Ibiza with the similar 1.6CR black pump oil burner in it. Then my daily commute was about 24 miles each way with about 85% of that motorway. That used to do an active regen about 2-3 times per month but definitely more in the winter. Regularly it used to kick in as I left the motorway. No start - stop on that car so the only way to see if it was regenerating was the high idle, about 1050 RPM if I recall. I just kept driving keeping the revs around 2K for a few minutes and it would clear. I never had any warning light on. Confusingly in the cold it would high idle also, this was not a regen just the car trying to warm up. In contrast my Yeti 2.0 170 I only noticed active regens about 4 times a year doing the same commute. Maybe the 2.0 got up to temperature quicker or maybe the Yeti not renown for its exceptional aero properties may have contributed to it causing the engine to work harder. When my situation changed to shorter journeys just before Christmas the Yeti was definitely regenerating more regularly as you would expect, some journeys it never got up to general operating temperature. As I anticipated this being the case I changed to an Octy 3 vRS TSi petrol.... which is nice. Anyway In the near 5 years of diesel DPF ownership I didn't have any DPF warnings or issues.

 

I would suggest if you're concerned, and certainly a daily regen would be a little concern for me, I'd get the dealer to check it out, It may be one of the exhaust pressure sensors a tad iffy (they have been known to fail across all manufacturers), there will be one in before the DPF and one after with the measurements read by the ECU to work out how blocked the DPF is.

A previous Yeti TDI 110 did this, had it checked a few times by a dealer and involved SUK but no fault found or reason as to why offered.

 

Eventually worked out myself that despite the 36 mile commute to work, the engine was not getting hot enough during the colder winter temps to regen 'normally'. Fitted a lower grill cover in the following two winters and this much reduced the regens.

 

 

 

TP

Mine regenerates about once or twice a week at the moment.  Bear in mind where I live and the lack of any fast roads, that's not a surprise.  The light has come on 3 times so far and leaving it idle for 15 minutes has fixed it (active regen here is not so easy).  I've interrupted many regens as I didn't have time to sit with it (i.e. arrived at work with 2 minutes to spare) but it's always sorted itself out so far.

As already mentioned, the increased RPM alone is not proof of a regen.

At this time of year it is quite normal for the car to raise the idle to speed up or maintain engine temperature.

It was quite possible for the older PD engines to consume more heat (for the interior heating) than they were able to produce (low speeds, heavy traffic, very cold external temperatures etc.). The newer (even more thermally efficient) CR engines are able to reduce the effects by increasing engine speed when needed, even after the engine temperature gauge has hit 90 degrees.

Edited 17 January, 201511 yr by silver1011

Do you have any knowledge if cars with the (fuel burning) auxiliary heater raise their revs to heat their engines, or are they smart enough to just turn on the aux heater?

The "engine must be running"status also relates to other stuff like engine load. Quite often my start/stop will be available but then gets disabled if I put on heated screens or seats. It doesn't necessarily mean a regen is in progress.

Post meant more of an addendum than a correction, if you know what I mean.

I get different messages if it due to heated screen, air con, electrical load etc.

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I get different messages if it due to heated screen, air con, electrical load etc.

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How strange.  For me if start/stop is available and I put on the heated screen for example start/stop becomes unavailable and the message simply reads "engine must be running".  Mine was built 28th November 2014 if it makes a difference - maybe they've revised the messages in the newer models?

A regen occuring on several consequtive days can be normal.

I drive 95% of the time on the highway at ~100kph.

As AndyVee points out, this is not the best conditions for regeneration because of the light load & high air flow.

 

Probably once a month I will arrive home with the fans running (regen kicks in when I come off the highway during the 2min drive through the town).

The next day, when I arrive at work, I will have the same thing.

The same when I arrive home that night..

etc etc

 

Each regen burns an amount of the soot in the DPF until the loading is under the level for the regen to end.

This can take a couple of days/attempts to complete if your driving profile is not suited but as long as you have no warning lights/messages the system is just adapting to the conditions.

At this time of year it is quite normal for the car to raise the idle to speed up or maintain engine temperature.

 

Do you have any knowledge if cars with the (fuel burning) auxiliary heater raise their revs to heat their engines, or are they smart enough to just turn on the aux heater?

 

Increased idle speed is normally activated based on coolant temperature so when the coolant gets warm the idle speed returns back to the normal level.

Therefore, with an auxilary fuel fired heated (which warms directly the engine cooolant) the engine should not raise the idle speed unecessarily if the coolant is already warm.

How strange. For me if start/stop is available and I put on the heated screen for example start/stop becomes unavailable and the message simply reads "engine must be running". Mine was built 28th November 2014 if it makes a difference - maybe they've revised the messages in the newer models?

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That's bizarre - I don't get any messages like that. It's definitely the screen heating that does it most of the time as if I switch it on I get "engine must be running" and if I switch it off start/stop becomes available again.  Certainly looks like they've dumbed down the messages in the newer models.  Either that or there's something wrong with my car :(

That's bizarre - I don't get any messages like that. It's definitely the screen heating that does it most of the time as if I switch it on I get "engine must be running" and if I switch it off start/stop becomes available again.  Certainly looks like they've dumbed down the messages in the newer models.  Either that or there's something wrong with my car :(

Mine was built early October, so is only a month older than yours (but mine is a 2015MY and yours is a 2015.5MY)