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 Post subject: DPF
PostPosted: Tue Oct 01, 2019 4:08 pm 
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Extreme Off Roader

Joined: Thu Jul 19, 2018 7:54 pm
Posts: 310
Location: East Hertfordshire
Car:: Xtrail
Model: Aventura Explorer diesel auto.
Year/Plate: 2008
Colour: Blue
Last night just before I got home my DPF light came on again, and that was after about 15 minutes of driving up a dual carriageway at 60mph+.

I bought the car at the beginning of August and two weeks later the light came on followed shortly after by the check engine light. I took it for a good blast up the motorway but it wouldn't go out. I then took it to a local garage where I have taken all my cars for years, and they did a forced re-gen for me, but a few weeks later the light came on again. This time after a motorway blast it went out, but now it's back on again. My driving is a mixture of motorway, dual carriageway and local driving, and I am rarely involved with town traffic as there are no really big towns round this way to get stuck in, and I am always on a fast road within a couple of minutes of leaving home, whichever way I go.

Is this normal for the light to keep coming on? I don't want to have to have a forced re-gen every six weeks, and I don't want to have to waste fuel going for a blast up the motorway every week even though I can do 60 on nearly every road immediately after leaving home, and usually do. Apart from the very occasional shopping trip I rarely do journeys of less than 15 miles, and I am retired so I don't commute. Any recommendations welcome.


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 Post subject: Re: DPF
PostPosted: Wed Oct 02, 2019 12:50 am 
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Xtrail Nut

Joined: Mon Dec 27, 2010 6:11 pm
Posts: 2837
Location: Cumbria
Car:: Xtrail
Model: T30
Year/Plate: 56
Colour: Silver
No. I'd say there was something wrong with your car. For some reason, it's not regenerating properly. There's no reason why a regen can't be achieved (on pretty much any car) with about 20 minutes of continuous driving above about 40 MPH. Booting it hard will be counter-productive (diesels make the most particulates when they're being booted hard). Just a nice, constant throttle 50-70 should be plenty.


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 Post subject: Re: DPF
PostPosted: Wed Oct 02, 2019 9:52 am 
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Extreme Off Roader

Joined: Thu Jul 19, 2018 7:54 pm
Posts: 310
Location: East Hertfordshire
Car:: Xtrail
Model: Aventura Explorer diesel auto.
Year/Plate: 2008
Colour: Blue
I thought it was the heat that burnt it off. I can see what you are saying about producing most particulates when booted hard, but the autos are very high geared. To get them over 2,000rpm you have to either hold the gears down manually, or drive at high speed. Mine does 60mph in 5th gear at around 2,000 rpm. In automatic you have to get it up to about 75mph before it will go into 6th, then the revs drop to about 2,200. It's a very relaxing drive. How do you generate enough heat without working it hard?


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 Post subject: Re: DPF
PostPosted: Wed Oct 02, 2019 12:20 pm 
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Extreme Off Roader

Joined: Thu Jul 19, 2018 7:54 pm
Posts: 310
Location: East Hertfordshire
Car:: Xtrail
Model: Aventura Explorer diesel auto.
Year/Plate: 2008
Colour: Blue
Just got back from a journey, and the light has gone out again. Hope this isn't going to keep happening though.


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 Post subject: Re: DPF
PostPosted: Thu Oct 03, 2019 9:55 am 
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Extreme Off Roader
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Joined: Thu Jan 17, 2019 10:32 am
Posts: 343
Location: Naarfolk
Car:: Xtrail
Model: 2.0dCi Tekna 173
Year/Plate: 2011
Colour: Ebisu Black
Mods: Nice full size mat in boot to stop dog sliding...and Celtic Remap 221hp!
IN an auto you need to lock it down a gear such as 4th and do a constant drive keeping revs if possible around 2250 - 2500 and that should do the re-gen. Shouldn't take any longer than 20 mins or even less.

It's strange how different vehicles run at different revs in top gear to make economical. My X trail runs at around 2000 rpm at 75mph and as yet (since Dec) I have never seen the light come on but mine is a late 2011 model which I believe is slightly different gearing/engine mods......... it's good on fuel averaging daily around 43 mpg rising to 50 in decent run off motorways. On motorways it hovers around 46/47 at 75mph. Conversely our 2007 VW T5 campervan which has 1.9 PD engine and 5 speed never has any DPF issues but in 5th gear at 75 mph it is doing 3000 rpm yet still returns average 39 mpg (not bad at all). Then again my wifes 2010 1.6 Golf tdi is 5 speed but 75 mph is at 2000 revs! Averages 57mpg and only recently at 99k have we had any issues on DPF which was the sensor. She spends all her time driving round Norfolk doing clinics so no much fast roads but lots of country roads................... just some omparisons.


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 Post subject: Re: DPF
PostPosted: Thu Oct 03, 2019 3:16 pm 
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Extreme Off Roader

Joined: Thu Sep 01, 2016 10:59 am
Posts: 213
Location: UK
Car:: Xtrail
Model: T32 Ntec
Year/Plate: 2014
Colour: Grey
Mods: Towbar :)
Isnt there also other criteria to start the regen? EG lights on, over half a tank of fuel, heaters on etc.

We had this on our T32 a few years back, RAC did a re-gen at roadside and since then we have only used VPOWER. Nothing since.

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 Post subject: Re: DPF
PostPosted: Thu Oct 03, 2019 3:59 pm 
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Extreme Off Roader
User avatar

Joined: Thu Jan 17, 2019 10:32 am
Posts: 343
Location: Naarfolk
Car:: Xtrail
Model: 2.0dCi Tekna 173
Year/Plate: 2011
Colour: Ebisu Black
Mods: Nice full size mat in boot to stop dog sliding...and Celtic Remap 221hp!
No - it all works from the DPF pressure sensor from what I know. When it determines DPF getting full it checks exhaust temp and then fires in more fuel to heat it up and start the burn off which you don't notice as you drive unless you check average fuel consumption as for a short while it will be poor. You can sometimes tell when car stationary as there's slight kerosene smell and exhaust is very hot. My Saab was good for this and at traffic lights you'd get that smell and when back up to speed and temp it carries on and finishes re-gen. Nothing to do with lights or amount of fuel in tank etc.....

From what my Saab dealer told me; and I'd assume the X Trail is the same, is that it will be far more efficient/better regen if car does it while driving as dealer regen doesn't clear it completely.

Like you I too only use shell V power or BP Ultimate - never supermarket and so have never seen the light on my X Trail ever light up!


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 Post subject: Re: DPF
PostPosted: Thu Oct 03, 2019 4:33 pm 
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Extreme Off Roader

Joined: Thu Jul 19, 2018 7:54 pm
Posts: 310
Location: East Hertfordshire
Car:: Xtrail
Model: Aventura Explorer diesel auto.
Year/Plate: 2008
Colour: Blue
Yes I've had to break my old habit of using supermarket fuel. Trouble is that when I had my old Volvo V70 it ran best on Sainsburys diesel. I tried all sorts of other fuels in it and nothing was any better. They just cost more! On V Power the performance was no better than on Sainsburys, and the fuel consumption was slightly worse! It was an old (year 2000) engine though with no DPF. Still ran like a watch when I got rid of it with 186,000 on the clock. It is still taxed and MOTd, so someone is still using it.

One thing I will say about modern vehicles compared with those from the 1960s and 70s, is that the fuel consumption has improved drastically. I remember an old car I once had which was an ex-flying-squad Austin Westminster from Norwich. If I drove it carefully on a long run I could just about squeeze 8 mpg out of it! Around town 5 - 6 was average. I had to plan my journeys around where the filling stations were. :o

I'll have to remember to drop my X Trail down a gear occasionally to get it to do a re-gen. Leaving it in auto means it's always running at too low revs.


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 Post subject: Re: DPF
PostPosted: Fri Oct 04, 2019 8:43 am 
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Extreme Off Roader
User avatar

Joined: Thu Jan 17, 2019 10:32 am
Posts: 343
Location: Naarfolk
Car:: Xtrail
Model: 2.0dCi Tekna 173
Year/Plate: 2011
Colour: Ebisu Black
Mods: Nice full size mat in boot to stop dog sliding...and Celtic Remap 221hp!
I had a 52 reg Saab 9-5 Aero auto estate few years back which standard was 250hp and very quick mid-range; perfect overtaking car but........ I had it tuned by specialists in Essex which took it from the healthy 250 hp and 380Nm to 300 hp and 430Nm torque. Car was then very very very fast and 3 figures came up in a flash. Rolling road was 60 in 4.2 secs. We took it to Germany and it still pulled at 145mph!!. However even as an auto I was amazed it would do high 30's and even 40 on long run if I was good but would only run on V Power or Ultimate; was bag of nails on supermarket stuff. We did manage once to get a tank of BP Ultimate 100 octane and OMG. With the right fuel it was a fantastic machine and easily competed against the V70R 300 in mid-range - the V70R though was 4WD so had the starting edge. I sold that with 168k and that too is still registered with a good MOT history and now showing 268k! That was Saab engineering before GM took over too much and destroyed the model.

On flip side I had a Hillman Hunter GLS with the Holbay tuned engine - never managed 15mpg with that!


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 Post subject: Re: DPF
PostPosted: Fri Oct 04, 2019 2:55 pm 
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Extreme Off Roader

Joined: Thu Jul 19, 2018 7:54 pm
Posts: 310
Location: East Hertfordshire
Car:: Xtrail
Model: Aventura Explorer diesel auto.
Year/Plate: 2008
Colour: Blue
I always like the Saabs. Never owned one, but I had friends who did. I seem to remember that one model had a Triumph Dolomite 1850 engine, which is a car I did have. Great car for its time.

I think it may be different with petrol engines and supermarket fuel though. I have had diesels for so long now I don't remember what I used to use in my petrol cars. It's nearly 20 years ago. Octane rating can make a big difference in cars with high performance engines. Sainsburys diesel was definitely best in my Volvo though. Cheaper and no loss of performance whatsoever. I must admit when I tried V Power in my Volvo I did expect their claims to be right and I would get better fuel consumption figures to offset the huge difference in price. 15p a litre difference between Sainsburys and V Power! I was astounded when performance was not noticeably different and consumption was actually worse, and I never used V Power again!


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