After a month owning Octavia 2.0 tdi 2015 diesel -1000 miles

I noticed 1000 rpm at tickover on completion of my 15 min journey

On switching off- the fan heater in engine continued for 5 minutes

I believe this is a passive regen i interrupted 

Does this mean on my next journey i have to replicate the driving which aĺows an active regen i.e 50 mph at 2500rpm for steady 15 mins or can i continue mixed roads typpe driving

Is a passive regen a regular occurrence at end of journey and if so should i be at all concerned?

I'm  a little nervous ( new to diesels) about this regeneration system and any advice would be welcomed

Is a passi

 

Just drive the car normally. You only need to take action if the dpf light comes on. I have interrupted a regen many times without an issue.

Thanks v much Durham fisher

2 hours ago, Stevetewkesbury said:

I believe this is a passive regen i interrupted 

What you are describing sounds like an active regen. If so there would have been a burning smell as well as the fan running on. The fan running on without the burning smell would just be a hot engine cooling down, but as you noticed a fast tickover it was most probably an active regen.

 

There are various levels of regen.  With the passive regen the ECU is not involved at all, the regen takes place when the exhaust gases reach a high enough temperature.  This tends to happen on long journeys with no particular requirements for speed or high revs.

 

Active regen is where the ECU gets involved in the process, whether it is happening with or without the driver adopting a particular driving style to trigger it.

 

At this stage you don't need to be concerned or to drive in a particular way to initiate a regen. The car will take care of it for you. There is no reason why a regen should be a regular occurrence at the end of a journey, as the car will not know it is getting near journey's end when it starts the process.  An active regen will only take about 5 to 10 minutes, and in most cases will complete before the end of a journey and you might not even be aware of it happening. 

 

In the event of active regens repeatedly failing to complete the DPF warning light will come on, and if that happens you will need to drive as prescribed in the manual.  However, you may never see the DPF warning light come on, as I have never seen it in almost four years of ownership, although I have had a very small number of interrupted regens. My car is the same year as yours, and it seems to be a commonly held view on here that there are more DPF issues with older vehicles.

 

 

Edited 28 September, 20196 yr by OldBoyScout
missed word

Oldboyscout

A very reassuring answer providing just the information  and clarity i need many thanks

Is it likely the active regen will start againon my nesxt drive?

1 minute ago, Stevetewkesbury said:

Is it likely the active regen will start againon my nesxt drive?

I don't see why not if the conditions are right for it. The ECU will decide.  I would imagine that if the regen got far enough to burn off a reasonable amount of soot before it was interrupted, it might not be necessary to start another one immediately, but I have not seen this mentioned anywhere.

 

If you want to read about this in more depth, there is some technical information from VW on this thread page 4:   https://www.briskoda.net/forums/topic/301020-my-new-diesel-smells-like-burning-rubber-andor-the-fan-stays-on-after-engine-is-turned-off/page/4/

 

And some more opinions on this thread:

https://www.briskoda.net/forums/topic/472118-kodiaq-rs-dpf-for-city-drivers/

 

Cheers oldboyscout

What you can do is buy a cheap OBD2 Bluetooth dongle on ebay and load the VAG DPF app on your phone for a few pounds and monitor the dpf properly and ascertain how your driving patterns and style plus weather conditions affect regens.

Based on my limited experience in a hired Kia diesel I'm not convinced that normal British driving conditions will allow a passive regen since it requires a 400+ C temperature and I would be surprised if cruising at 70mph alone will get up to that operating temperature. Most of our active regens occurred on a motorway, the hot burning smell being the giveaway.

A news story the other day reported that Australian Police in a BMW 5 series diesel had pulled over a vehicle just off a road and parked up behind it as normal to 'interview' the offender. Their diesel must have been undergoing a regen at the time and the hot pipe ignited the tinder-like grass underneath setting off a fire that destroyed their car completely (A$200k costs).

ThanksGERRYCAN

On 28/09/2019 at 21:10, Stevetewkesbury said:

I'm  a little nervous ( new to diesels) about this regeneration system and any advice would be welcomed

 

You should ignore all the rumour & scare stories. Most of these come from 15 years ago when DPF technology was new & untested in the real world.

Modern diesels are very good at managing the DPF so there is nothing for the driver to do unless the warning light comes on.

 

Its a shame that VAG still keep the increased idle & high fan speed during regeneration as this unnecessarily worries customers for no reason.

Every car I've owned has been a diesel with a DPF (except one) & my Skoda is the first to make it so obvious when regeneration is happening. BMW, Ford & Volvo all occured seamlessly without any obvious signs of regeneration.

DPF problems are not entirely dead and buried.

There is a class action brewing in Australia against Toyota for their relatively recent introduction of DPF and ensuing problems on large SUV and ute diesels.

 

11 minutes ago, Gabbo said:

 

You should ignore all the rumour & scare stories. Most of these come from 15 years ago when DPF technology was new & untested in the real world.

Modern diesels are very good at managing the DPF so there is nothing for the driver to do unless the warning light comes on.

 

Its a shame that VAG still keep the increased idle & high fan speed during regeneration as this unnecessarily worries customers for no reason.

Every car I've owned has been a diesel with a DPF (except one) & my Skoda is the first to make it so obvious when regeneration is happening. BMW, Ford & Volvo all occured seamlessly without any obvious signs of regeneration.

Thanks gabboGannon