Technical Location of DPF differential pressure sensor.

[alanshep6]

Hello.

I parked my Qubo up a couple of years ago at a family members house about 2hrs away so don't have immediate access to the car.

Just looking at getting it back on the road. Had a go at cleaning the DPF myself off the car. Got it started last weekend but the DPF pressure differential seemed high (about 130 millitbar at tickover) and the exhaust smelt horrible - didn't dare let the car run for too long because of upsetting the neighbours.

Going to have another look at it this weekend. Does anybody know how easy it is to access the DPF differential pressure sensor? I could see the two rubber pipes where they connect to the DPF metal pipes but didn't look beyond that.

Thanks

Alan

 

[bugsymike]

Hello.

I parked my Qubo up a couple of years ago at a family members house about 2hrs away so don't have immediate access to the car.

Just looking at getting it back on the road. Had a go at cleaning the DPF myself off the car. Got it started last weekend but the DPF pressure differential seemed high (about 130 millitbar at tickover) and the exhaust smelt horrible - didn't dare let the car run for too long because of upsetting the neighbours.

Going to have another look at it this weekend. Does anybody know how easy it is to access the DPF differential pressure sensor? I could see the two rubber pipes where they connect to the DPF metal pipes but didn't look beyond that.

Thanks

Alan

Basically follow the two metal pipes from the DPF back to the sensor.
Although from what you describe I suspect it will be more of a very serious clean of DPF rather than a sensor issue.
When it failed was the vehicle mainly used for low speed town use?
If so to avoid DPF Regen issues I have found a regular use of DPF cleaner additive in the fuel tank, followed by at least once a month 30 mile run along dual carriageway without stops with engine fully warmed up and revs between 2000-3000 RPM so working hard, not pottering along.
I had similar on a Citroen C3 Picasso 1.6Hdi and was able to remove the DPF, clean it in a tank of strong bleach inbetween use of commercial oven cleaner and blasting with a commercial steam cleaner which got a lot of brown muck out and water then flowed through much easier.
Afterwards I used my friends Diagnostic to tell the ECU the DPF had been replaced and it ran perfectly for another 4 years with occassional DPF additive in fuel tank, plus more "spirited driving.

 

[alanshep6]

Thanks for the reply.

It was being used most recently as a dog walker's vehicle so lot's of short journeys. It was high mileage (170,000) when we bought it (had been a courier vehicle) but didn't use any oil.

We've added about 25,000 miles since and at some point it started to use a lot of oil and started to run regular regens.

I took it off the road to do a compression test which meant taking the turbo and dpf off to get at the glowplugs. The results were pretty good but only recently did I get round to putting it back together - decided to give the DPF a clean before doing so.

When I started it last weekend it was showing DPF clogging at about 60% which I think is better than it used to show but it quickly brought up errors saying "Stage 1 clogging detected" and "Stage 2 clogging detected" which it never used to do. The cooling fan was coming on at some stage even though the car was only running a short while - so not sure if it was trying to start a regen?

Going to have another look at it tomorrow. The car doesn't owe us anything and I know it's high mileage but I'm curious to work out what going on.

 

[bugsymike]

Does sound like Regen/DPF issue.
A error code read may give you more detail.