Omf - dpf regen light on - B7 Passat TDI

[Beltway]

Interesting I read the b7 passats in India come without a dpf because of the poor quality of the diesel over there. I wonder if minimum quality is the only important thing or is it a case of using the highest quality available, vortex etc.. In an effort to minimise potential issues ? Either way I think I'll be using the vortex for peace of mind.

[cru22z]

Has my 3rd dpf light on! Same scenario drove to the city on the m4 in the morning traffic
And home in the evening traffic. Traffic was crawling but the dpf light went off after 20mins in
The traffic.

[cru22z]

Anyone have some instruction on how to check
The DpF level etc using the vCDs cable?

[cru22z]

I had my 9th DPF light now and this time even after almost an hour of
High revving highway driving the light is still on.
Just had my car service last week and the service centre couldn't find anything on the
Diagnostic report after I reported constant dpf light on.
What should I do now? My dealer is hopeless.

[h100vw]

Diesel Particle Filter Emergency Regeneration - Ross-Tech Wiki

MVB 075.3: Particle Filter Load

Can you get a VCDS lead to look at it with?

Gavin

[jamesdavid]

The dpf critical soot accumulation levels should be checked by the dealer as per service schedule, i know that for a fact on audis anyway. Clip don't be scared off by them, the diesels are great i've seen them do 1000+ ks to a tank. From my understanding unless its changed, yellow dpf is a regeneration (burning of soot accumulation in dpf) capable of being performed by the customer, red dpf warning light indicates that the dpf is saturated and requires immediate forced regeneration which can only be ran using manufacturer diagnostic equipment. Essentially the ecu stalls up the car between 1500-2000rpms and gets the dpf red hot in an attempt to burn of soot. The g450 exhaust gas pressure sensor is used to help calculate critical soot accumulation in the dpf.

[jamesdavid]

Beltway, Cetane is the quality rating given to diesel, from memory vw specifies a cetane rating no lower than 51, (don't hold me to that). Cetane ratings lower than that cause excess soot post combustion, which would make sense in regards to no dpfs in India. Just as using the highest cetane rating diesel would help produce a cleaner combustion.

[Diesel_vert]

Beltway, Cetane is the quality rating given to diesel, from memory vw specifies a cetane rating no lower than 51, (don't hold me to that). Cetane ratings lower than that cause excess soot post combustion, which would make sense in regards to no dpfs in India. Just as using the highest cetane rating diesel would help produce a cleaner combustion.

That's true, but the effect of cetane on exhaust emissions isn't linear.

The overriding reason why cars are not equipped with DPFs in markets like India, is due to the high levels of sulphur in their fuel (350 ppm natinowide in India, 50 ppm for selected areas only).

Sulphur acts as a poison for DPFs, in the same sort of way that leaded petrol is bad for catalytic converters.

In Europe and Australia, the maximum allowed sulphur level for on-road diesel fuel is 10 ppm, so the choice of fuel would have little impact.

[Greg Roles]

Wouldn't it be more likely India probably has less strict laws??

If you are having DPF issues, you really need to buy / beg / borrow a VagCom cable, and do some forced regens whilst monitoring EGT's - channel 075 under engine measuring blocks. The Force DPF regen code in the Coding II section is 21295, but drive somwehere that you can run in the hills / highway and get the thing working to aid temps. If you aren't seeing 800 degree pre DPF temps, it's not going to regen effectively, 600 is about where the DPF regen will fail. Normally you see 400 or less.

I'd always recommend the best diesel you can find, a lot of injector issues come about from using cheap diesel, and running a fuel aditive with Cerium in it helps break down the soot. They usually cost $30 or so though, and I use Moreys Smoke killer which does increase the length of time between regens in my experience.

Remember below 2000rpm is soot territory, up at 3500rpm as mentioned by a previous poster you wonlt see much at all in any diesel engine unless it has a overfuelled ( poor ) tune or dirty injectors etc etc.

[Diesel_vert]

Wouldn't it be more likely India probably has less strict laws??

Fuel quality and exhaust emissions are closely linked to each other. You can't have high sulphur diesel without high emissions of pollutants.

It is common for many developing nations to have less stringent fuel and emissions standards compared to Europe, but as their economy and infrastructure improves, they are slowly catching up.

...

Meanwhile in Australia, as it stands, no amount of additives will ultimately prevent the DPF from clogging up without having to do a forced regeneration.

It is not impossible for a diesel engine to pass an emissions test without a DPF, but that would involve a significant departure from current European engineering and design philosophies, or the use of synthetic diesel.


In other words OP, you will simply have to deal with it and manage it somehow - or get rid of the car.