Omf - dpf regen light on - B7 Passat TDI

[Diesel_vert]

Ok today I took car on freeway as per suggestion above.
I noticed the car won't regen anymore like it use to when I
Drive it hard on freeway. I also noticed there is not much power as it use to.
The cars auto start /stop also works even after highway driving.

Should I continue to drive the car or give it a break until I see the independent Vag com.

If the glow plug (coil) light and/or check engine light is on or flashing, I would recommend you avoid driving the car if possible.

Otherwise, continue to drive it as per the instructions in the book.

[cru22z]

If the glow plug (coil) light and/or check engine light is on or flashing, I would recommend you avoid driving the car if possible.

Otherwise, continue to drive it as per the instructions in the book.

The lights has been cleared by the NRMA assist, so far I have not seen it again.

It seems to me that Diesel is steadily losing it's appeal as its traditional virtues of simplicity and reliability and low running costs (servicing repair etc) are being wiped out by new emissions technology. Diesel should be more cost effective and efficient, however if the car is forcing drivers to go on long drive just to Clear the DPF then I guess it's pointless.

[Diesel_vert]

The lights has been cleared by the NRMA assist, so far I have not seen it again.

It doesn't necessarily mean the problem is solved, so keep your wits about you.

It seems to me that Diesel is steadily losing it's appeal as its traditional virtues of simplicity and reliability and low running costs (servicing repair etc) are being wiped out by new emissions technology.

Old tech is simple and reliable... but it's also slow, breathless, noisy, polluting, less efficient, etc.

If you want power, torque, refinement, efficiency, and all that jazz, you need to up the level of tech - which adds complexity.

Which is not bad per se (just because it's complex doesn't it can't be reliable) but if the complexity isn't well managed, then reliability will take a dive.

Diesel should be more cost effective and efficient

No, it depends on whether your personal driving circumstances can make diesel more cost effective and efficient.

Many people buy hybrid or diesel cars without doing their research or without doing their sums properly.

For example, a person who does 30000 km annually will definitely be better off with diesel engine, whereas a person who only does 5000 km annually will definitely be better off with petrol engine.

If you lie between these two extremes, then it's time to get out Microsoft Excel and find out where you stand.

however if the car is forcing drivers to go on long drive just to Clear the DPF then I guess it's pointless.

It's a design philosophy that VW has chosen, which has its pros and cons.

Unfortunately, it just happens that you're experiencing those cons right now.

...

Having said all that, until you can get your car scanned, we don't know what the true problem is, and what the extent of that problem is. It may simply be a borked sensor, or may require replacing the DPF itself, or maybe the entire engine is stuffed! - it's all just speculation.

Like I said previously, as soon as the glow plug light and/or check engine light comes on, you need to drive straight to the dealer if practicable, don't turn your engine off when you get there and get them to plug in the computer then and there.

[cru22z]

Since the vw/nrma roadside guy cleared the dpf/glow plug/cel lights my have yet to hear
my car do a regen. In the last few days I have been on freeways on high rpm.
When I get to the end of freeway the start/stop kicks in.
Should I be worry? Do u guys get a regen on freeways and when u get to the end at the lights
It's still running say the trip on the freeway was like 1/2 hour.

I'm really worried! I know I have an appointment with a local vag com shop on Monday but my
Appt wit Vw is another week.
I just don't want to do more damage not knowing what's going on now.
From having the dpf light not go off even after 2 days of highway driving to clear it, to getting the cel light
and limp mode on the way home and the nrma guy cleared the error and car just went back to drivable again.

[entice]

Start stop should work at the end of a freeway.. that's what its supposed to do isnt it?

only stops working if the battery isnt in a condition where it can fulfil its requirements.

Well that's my simple understanding of it.

Wife's car has 7K Km's on it.
she mainly drives it, mostly in traffic. No DPF issues yet.
Use to own a 1.9 CDTi Astra (no DPF, tuned) and a s=twin Turbo Saab 93 (DPF, and tuned) - nil issues and both driven hard
then purchased a Subaru Diesel Outback (DPF and Tuned) and had several forced regens...
Passat seems to have less issues and less noticeable regens. Mind you, we also take it out for a run once a month or so... I watch the oil temps and not sure if they correlate to when a DPF purge is going on, but I watch them get to 110 degrees and it makes me warm and fuzzy, thinking that a regen is on.

I'd think you have an issue with a dud sensor.... but I'm no expert...

[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.