Omf - dpf regen light on - B7 Passat TDI

[cru22z]

Is this normal???

I took a 20 mins drive on the M7 on Sports mode, when I get to my destination the light pops-up.
I then drove back on the M7 on Manual mode on 4th gear 3000+rpm constantly on 110+ kph..cops where everywhere lucky
none was paying attention to me. Anyways after I exited the light went off.
Does this mean my car is ok?

Is this light bad? should I only be getting this once??
Any experiences please.

[Transporter]

Get the DPF checked by the dealer, they should also check the DPF pressure sensor.

If you do mainly short trips, make sure you don't use accelerator when necessary, less particles will be generated and your DPF will last longer. The key to successful regeneration is the steady speed, engine at full operating temperature, more than 1/2 tank and 1500-2000 rpm, at least 20 minutes drive. The last time I used sports mode in our Touareg V6TDI regenerating through the hills but kept the accelerator steady.

The ECU will regenerate the DPF approx. every 1000km without any light on the dash.

Abrupt driving = more soot trapped in the DPF

[dopey]

I do a lot of short trips (with the occasional long one) and give my car a bootful pretty much every time I drive it.... no DPF issues to report here. I was told to make sure I do give it a good rev every now and then to help clear the DPF *shrug*

Wouldn't be too worried but call the dealer and ask them whether it's worth getting it checked in case they suspect you've got a dodgy sensor or something.

[Transporter]

I was told to make sure I do give it a good rev every now and then to help clear the DPF *shrug*.

That's good for your turbo and not for the DPF. If you do just one or two hard accelerations per day, that's more than enough to keep your VNT clean.
I do it when driving up the hill.

[cru22z]

Thanks Guys, I'll call the dealer for a check -up. Also i noticed the idle RPM was quiet hight at nearly 1k RPM. Do TDI do this? I normally notice it at around 800 rpm.

[Inego]

Higher idle speed while a regen is occurring. I have a Skoda Scout, and the DPF light comes on a couple of times a year - an immediate run for 20 mins or so keeping it about 2000-2500rpm clears it.

But not dealing witht he issue ASAP results in a blocked dpf, as I discovered within 6 weeks of getting the car.

[Transporter]

Thanks Guys, I'll call the dealer for a check -up. Also i noticed the idle RPM was quiet hight at nearly 1k RPM. Do TDI do this? I normally notice it at around 800 rpm.

The increased idle during regen. as well as a bad odour is normal at that time. The active regeneration (activated by ECU) last around 10minutes (the first 10 minutes or so, is to increase the DPF temperature). The speed you're driving is not very critical, try to keep it between 1500-2000rpm by shifting into S mode if you can. What is important is the exhaust temperature, so the engine must be under the load you can help it buy turrning the accessories ON (A/C, heated seats, head lights, window demister). The steady throttle during regen. is also important.

[Transporter]

I don't use stop start in our Tiguan, I prefer to keep dpf cleaner for longer.

Sent from my GT-N8000 using Tapatalk 2

[Greg Roles]

Yep you will see oil temps rise 10 degrees or so when a regen is going on - a great way to check.

cru22z - no need to worry. The car will absolutely do what it needs to regardless of clearing error codes - if there was an issue the codes would be straight back. Trust me on that!

At the typical 40% load, the car does a regen, you typically don't know about it, the car waits till you hit a certain speed and coolant temp, and you may notice a little rougher drive, a little more induction noise, but it's usually quite "invisible".

At 60%, the DPF light comes on, the MFD gives you the "follow instructions" readout - and all this means is "go for a decent drive, now". Again typically the car waits for the coolant to get up to temp, but not always.

IF these 60% plus regens fail, the car will throw the coil and DPF lights, do the MFD instructions, and it can happen from cold, the car goes into a sort of "panic" mode, each and every time you start the car it will keep doing this until it regens properly. I've played with this extensively, and even clearing codes, the car will work out the DPF is overloaded and throw the lights and regen within minutes of the next start.

At 80% - something I have not forced simply due to the possible danger - the car is into limp, and again, you have no way around it. Clear the codes, it will go back into limp within a minute, according to the books and what I have heard. The car turns off auto regens at this stage, and forces limp so you have to go to a dealer and have them force a regen at idle. At this sort of load the thing can possibly catch fire if it regens whilst driving, has to be done at the dealer under controlled conditions.

What I think happened cru22z, is the car has regenned down to sub 40%, thus the regens are off, even though NRMA cleared the codes. If you get it to 39%, the car will be perefectly happy to have the forced regen codes cleared, and will go back to the typical 40% invisible regen. It takes even a stuffed DPF a good week to fill under normal driving, so you'll be fine to get to both the Vag Com shop, and the dealer I reckon.

Ask the dealer to recalibrate your DPF pressure sensor, and to check if it the "old" one or the new one. They should be done under warranty but are not expensive really.

[cru22z]

Thanks guys. I actually experienced a regen coming off the highway.
Even though its interupted (fan running after I turned car off) I'm happy
I know it's doing regen. So hopefully after a vag com check nothing major is
uncovered or atleast find the problem to be fixed.