The Yeti is the first DPF equipped car that I have had so its a vertical learning curve, I am gobsmacked at how many parameters there are in the engine control module "advanced measuring blocks" OK many like the start-stop parameters are not applicable to my vehicle but the amount of sensors is scary.

 

I wanted to see what the expected life remaining is for the DPF, I can see how many kms it has done since the last regen and I think it has to be divided by 1000 as its in metres, it would be 180km if thats the case, how often do these engines do a regen.

 

It says that a regen should happen at 33g of soot (or is it oil?) and the calculated soot load was just beneath that and rising as the engine ran 0.1g at a time, I expected a regen to happen when it reached 33g but the oil was not up to temperature, then I saw that the measured soot load was 3g, presumably that comes from the DPF differential pressure sensor.

 

So does my DPF have 3g of soot 180kms after a regen or 33g and why the difference?

 

Is the number of "engine starts" correct or does it mean something else? It shows something like 234 engine starts for 130000 kms.

It's oil ash volume that'll give you the best idea of how long the DPF might last. These are the deposits that a DPF regeneration can't burn off and will eventually block the DPF. I think the max is either 80g or 0.180l, at least that's what the VAG DPF app generally seems to report...

 

The distance between regens can vary greatly on driving conditions and engine health, anything between 150-400 miles is probably normal.

 

There should be two soot values, calculated and measured. It's normal from them to differ as I don't believe calculated takes into account passive regeneration.

They are generally less important assuming they don't get high enough to block the DPF as the car should be able to perform a regeneration and burn it off. I've never seen 33g mentioned as an important value so I'm not sure where you found that from?

 

Graph taken from an old VW self study program giving an idea of soot level behaviour:

The 33g (might have been 30g, I have no short term memory) was another VCDS measuring bliock parameter and its the threshold at which a regen should be triggered, it can be adjusted but I left it well alone.

 

Passive regeneration being normal high speed running without additional fuel added post combustion?

 

Thanks for the reply, I will take notice of the oil/ash volume next time now that I know its significance.

Correct, passive regeneration will occur naturally under certain circumstances. If the DPF gets hot enough it'll start to burn off the soot slowly but obviously an active regeneration is more effective and quicker.

 

I think you should be able to use VCDS to create a map of all the measuring blocks, it'll make checking various values easier. Might do my ECU if I remember tomorrow

Hi All,

 

My old man’s yeti had the dpf light up along the with the eml light and flashing coil, i ran a scan with obdeleven and came up with the details below.

 

is it too late to take he’s motor to a garage for a forced regen?

 

i think i read somewhere that once the dpf is passed 95% full you need to replace it.

 

any help is appreciated.