Omf - dpf regen light on - B7 Passat TDI

[Transporter]

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

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[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.