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Adblue and DPFs

9.9K views 9 replies 3 participants last post by  Alfie155  
#1 ·
Here’s a cautionary tale.

Someone on the forum recently queried the capacity of the Adblue tank at more or less the same time as my Low Adblue warning light pinged on. Nowhere does the Stelvio indicate the state of the tank level so when you are warned the tank is low – how low? Is it half full, 7/8 empty, who knows?

So I bought 2, 10 litre canisters of Adblue for £20 from Halfords – better value than the £8 for 3.5L version.

Not knowing how much to put in I (foolishly) guessed at about 3L and went for a run, warning light extinguished so all good. Car was 4-up for a trip to a family lunch, came upon a slow-moving vehicle and accelerated past quickly, whereupon the throttle felt dead, all power gone and the Engine Check light was on. Fortunately we were near our destination but the last few miles up very steep winding roads was hellish with zero power on tap.

I rang my dealer – they suggested leaving the car for a while as it might reset itself(?!)

After several hours, attempted the run home, engine check light still on but full power restored, phew.

The next day, put the rest of the 10 L canister in and rang International Rescue. Scott Tracey plugged in his EOBD and pronounced 1. An internal Error and 2. A “plausibility” error and 3. an 83% full DPF! No amount of fiddling gave any info about the state of the Adblue tank.

He advised referring back to Alfa as he couldn't reset the engine check light so I called them again. Implausibly they couldn’t comment on the Plausability Error code but suggested a steady run at 50mph for several miles to clean up the DPF.

Easy enough using cruise control on the A3 and after 20 miles or so, pulled into a layby, turned off and waited a short while. Restarted and miraculously she fired up, light gone and DNA switch working again. Driving the lanes near Liss in D Mode and suddenly engine check light is back on and limp mode engaged.

Stopped and waited a while but no better so nowt for it but to limp back home. The hilly bits of the A3 a nightmare but downhill ok, managed 50mph with very light throttle.

Now here’s the thing, as referred to in another thread I am still awaiting a cure for IBS, after the fuel gauge recall, the Intelligent Battery Sensor being blamed for low battery power in terms of stop/start failing and the still unsorted false alarm soundings. The Service Dept called me a week ago to say Alfa are sending a senior technician over from Italy to check everything (and giving me a Giulia as a loaner!) so here’s hoping they can sort out all these niggles once and for all as the ownership experience is beginning to wane a bit now. I believe another Stelvio is being called in as well – anyone on here?
 
#2 ·
From experience, I’ve had about 4.5k miles or so from each tank of adblue. Warning comes on with about 1k miles till empty and the tank is 16ltrs I believe. I do mostly motorway driving. DPF regen issues should have nothing to do with Adblue, more to do with driving profile. The more short journeys and town driving, the more likely to have dpf problems.
 
#3 ·
Thanks for response Steve. I'm so fed up with this and a few other issues with my Milano, I didn't put together a particularly coherent post.
Being a disciple of Honest John, the Daily Telegraph motoring writer, I was well aware of the mantra to avoid short journies with a diesel so I use the Alfa only for long distance, open road journies. My previous oil-burner, a Mazda 2.2TD hardly burned a drop of Adblue and there was never a hint of a DPF problem in 40K+ miles. So to find out the hard way that the Alfa diesel guzzled 16 L of the stuff in the first 3700 miles was a surprise - and I'm assuming it left the factory with a full tank. To not have an Adblue tank gauge is I feel a serious omission which leads me to believe I'll have to drive around with a Halfords 10L flagon of the stuff in the boot forevermore just in case. As you are the only respondent to my post are we to believe we are the unlucky ones or is this consumption completely 'normal?'
As you infer, Adblue is used to reduce the NOx emissions to help diesels meet the Euro6 emissions standards, and perceived wisdom is I thought, the more economically you drive the longer a tank of it will last. Not so it seems in this case.
My DPF issue was revealed when I queried the engine management light remaining lit so I made the quantum leap that the 2 events were somehow linked.
As my alarm issue wasn't resolved at the recall and the unknown to me IBS issue was revealed, I'm glad that the dealer is taking this seriously by escalating it up to Alfa factory level. Incidentally they fixed my fuel flap by simply re-mounting it, which so far has worked.
I'll know more in due course.
Cheers.
 
#4 ·
Mine is going in for its first service in a few weeks and I forgot to mention adblue consumption to the list of niggles it has. I will and see what the dealer says. You shouldn’t need to carry around a gallon of adblue, the warning is good enough to give you plenty time to get more.
I’m buying 20ltrs at a time from Amazon, £15 delivered.