DPF REGEN HELP

21
Found 26th Oct 2017
Hope this is posted in the right place. I'm hoping some one is able to assist me with my dpf problems as I have seen a few car questions on this forum.
I have a Vauxhall zafira diesel 08 plate and the coil light is flashing. I have had the maf sensor replaced , new brakes, cam sensor and only last week a forced regen. The light started yesterday. I spoke to my mechanic who said I needed to drive it on the motorway for about 30 mins at 70mph to clear it and the light would stop flashing. I also hear a grinding sound from the underside at the front which no one seems to think is a problem but it is to me. I was told it could possibly be the wrong engine oil used ( service was done my an independent mechanic) and that could be the reason the DPF has blocked quickly and maybe explain the grinding too.
Upon starting the car it sounds like it's chugging but after a few seconds smooths out.
My mechanic is coming tommorow to have a look but what I wanted help with is it safe to drive with the coil light flashing in order to clear the DPF? Is It likely to cause more problems than rectify any? It is an automatic if that makes any difference.
Thank you in advance.
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The dpf is probably blocked due to the egr valve sticking. Ask your mechanic to remove and clean it, it’s a common problem on the zafira . Also get him to check the dpf pressure pipes are not split. The dpf will only block if it has another fault causing it or you are only doing short journeys. Whatever you do don’t get the dpf removed or replaced with an aftermarket one
I have a 12 plate Insignia (so possibly the same warning lights) and a blocked DPF warning light is a steady amber exhaust with soot coming out of it and not a flashing coil light. Do you have the handbook as all the lights are listed in there. To do a forced re-gen on mine I drive up the motorway over 3000 revs for a few miles and the light clears, has happened 3 times since new.

edit, just read your is an automatic so unsure how to force a higher revs (apart from speeding) although the hand book should tell you how to clear the DPF light.
Edited by: "paulj48" 26th Oct 2017
paulj4825 m ago

I have a 12 plate Insignia (so possibly the same warning lights) and a …I have a 12 plate Insignia (so possibly the same warning lights) and a blocked DPF warning light is a steady amber exhaust with soot coming out of it and not a flashing coil light. Do you have the handbook as all the lights are listed in there. To do a forced re-gen on mine I drive up the motorway over 3000 revs for a few miles and the light clears, has happened 3 times since new.edit, just read your is an automatic so unsure how to force a higher revs (apart from speeding) although the hand book should tell you how to clear the DPF light.


Similar to my mothers old Zafira, 3-4 times a year she would hand it over ft me or an Italian service. After a blast to the local costco and back hanging onto to each gear, and revving the hell out if did the trick.

Thankfully she finally has switched to a petrol.
Original Poster
Thank you for your quick responses. I was also baffled by the coil light but apparently it means you need to carry on driving to unblock the DPF. This is what I gauged from other forums with regards to the zafira in particular. In fact my car was 300% yet no dpf light came on only the coil which after a forced regen went out.
I also thought possible egr problem but it had a mot last week, in fact all repairs listed happened in the last two weeks.
What I don't want to happen is me drive down the motorway at top speed and the car suddenly stalls or goes into limp mode. Wish I had never purchased a car with a DPF!!!
DKLS41 m ago

Similar to my mothers old Zafira, 3-4 times a year she would hand it over …Similar to my mothers old Zafira, 3-4 times a year she would hand it over ft me or an Italian service. After a blast to the local costco and back hanging onto to each gear, and revving the hell out if did the trick. Thankfully she finally has switched to a petrol.


Sound like you need a pesto top up.
JEROME7741 m ago

Thank you for your quick responses. I was also baffled by the coil light …Thank you for your quick responses. I was also baffled by the coil light but apparently it means you need to carry on driving to unblock the DPF. This is what I gauged from other forums with regards to the zafira in particular. In fact my car was 300% yet no dpf light came on only the coil which after a forced regen went out. I also thought possible egr problem but it had a mot last week, in fact all repairs listed happened in the last two weeks.What I don't want to happen is me drive down the motorway at top speed and the car suddenly stalls or goes into limp mode. Wish I had never purchased a car with a DPF!!!


The egr won't be part of the mot so it could still be that. They do tend to stick and cause problems
Original Poster
danzab20 m ago

The egr won't be part of the mot so it could still be that. They do tend …The egr won't be part of the mot so it could still be that. They do tend to stick and cause problems


Thank you. I always had that in the back of my mind but assumed it would have been checked although I never specifically asked anyone too. I'll definitely ask the mechanic to have a look at that. Would that also cause the grinding sound? And most importantly should I go on a long drive or do I risk stalling?
JEROME7737 m ago

Thank you. I always had that in the back of my mind but assumed it would …Thank you. I always had that in the back of my mind but assumed it would have been checked although I never specifically asked anyone too. I'll definitely ask the mechanic to have a look at that. Would that also cause the grinding sound? And most importantly should I go on a long drive or do I risk stalling?


It won't cause a grinding noise, that will be a separate fault. It could possibly be a split dpf pressure pipe and gas escaping of the dpf is badly blocked. If your are not comfortable using it then I would wait until your mechanic can look at it for you
Original Poster
danzab19 m ago

It won't cause a grinding noise, that will be a separate fault. It could …It won't cause a grinding noise, that will be a separate fault. It could possibly be a split dpf pressure pipe and gas escaping of the dpf is badly blocked. If your are not comfortable using it then I would wait until your mechanic can look at it for you


Thank you i will mention this to the mechanic.
JEROME772 h, 44 m ago

Thank you for your quick responses. I was also baffled by the coil light …Thank you for your quick responses. I was also baffled by the coil light but apparently it means you need to carry on driving to unblock the DPF. This is what I gauged from other forums with regards to the zafira in particular. In fact my car was 300% yet no dpf light came on only the coil which after a forced regen went out. I also thought possible egr problem but it had a mot last week, in fact all repairs listed happened in the last two weeks.What I don't want to happen is me drive down the motorway at top speed and the car suddenly stalls or goes into limp mode. Wish I had never purchased a car with a DPF!!!


No need to break the speed limit, just drive at 70mph, in third to keep the revs around 3000 rpm, avoid the instinct to stick it in 6th.
Edited by: "DKLS" 26th Oct 2017
DKLS4 m ago

No need to break the speed limit, just drive at 70mph, in either third to …No need to break the speed limit, just drive at 70mph, in either third to keep the revs around 3000 rpm, avoid the instinct to stick it in 6th.


Ops is an automatic
My zafira also had a similar issue to yours. The coil light was flashing and there was sometimes a lot of white smoke coming out of the exhaust. I find it helps if you 'thrash' the car once in a while. By thrashing I mean accelerating rapidly if its safe to do so.
Original Poster
DKLS2 h, 33 m ago

No need to break the speed limit, just drive at 70mph, in third to keep …No need to break the speed limit, just drive at 70mph, in third to keep the revs around 3000 rpm, avoid the instinct to stick it in 6th.


Yes I have an automatic so it becomes slightly trickier. I actually tried using the sport button once, but that ended up with the engine management light on and limp mode.
I don't understand why they don't just invent a simple button to initiate the process rather than all this kerfuffle.
Original Poster
TheRatedSeller2 h, 9 m ago

My zafira also had a similar issue to yours. The coil light was flashing …My zafira also had a similar issue to yours. The coil light was flashing and there was sometimes a lot of white smoke coming out of the exhaust. I find it helps if you 'thrash' the car once in a while. By thrashing I mean accelerating rapidly if its safe to do so.


Mine also has lots of smoke, it can sometimes get me some worrying looks from other motorists who think the car must be on fire.
The dpf is probably about ready for replacing, they fill with ash eventually. Anyway a good trip on motorway with heavy acceleration will probably complete the regen. Best option is to hollow out and remap. You will get much better performance, economy and no more dpf problems.
Original Poster
.MUFC.1 h, 1 m ago

The dpf is probably about ready for replacing, they fill with ash …The dpf is probably about ready for replacing, they fill with ash eventually. Anyway a good trip on motorway with heavy acceleration will probably complete the regen. Best option is to hollow out and remap. You will get much better performance, economy and no more dpf problems.


Thank you, that is something I was considering. I was thinking to get rid but the implications are too much. I will put your suggestion forward to my mechanic.
JEROME776 h, 34 m ago

Mine also has lots of smoke, it can sometimes get me some worrying looks …Mine also has lots of smoke, it can sometimes get me some worrying looks from other motorists who think the car must be on fire.



Yeah sometimes its a bit embarrassing. I find it helps to get rid of the smoke by putting the car in neutral and pressing down the accelerator pedal when you are stationary and its smoking.
.MUFC.17 h, 16 m ago

The dpf is probably about ready for replacing, they fill with ash …The dpf is probably about ready for replacing, they fill with ash eventually. Anyway a good trip on motorway with heavy acceleration will probably complete the regen. Best option is to hollow out and remap. You will get much better performance, economy and no more dpf problems.


DPF’s are part of an MOT now and if seen to have been removed will fail the test. Yes some garages will turn a blind eye, others won’t.
paulj481 h, 43 m ago

DPF’s are part of an MOT now and if seen to have been removed will fail t …DPF’s are part of an MOT now and if seen to have been removed will fail the test. Yes some garages will turn a blind eye, others won’t.



They wouldn't know if you hollowed it out, sometimes you have to cut open to hollow them out, in this case weld the blind side or behind an heat shield. It would only fail if it has been removed, 99% would pass one that has been hollowed out.
Original Poster
.MUFC.40 m ago

They wouldn't know if you hollowed it out, sometimes you have to cut open …They wouldn't know if you hollowed it out, sometimes you have to cut open to hollow them out, in this case weld the blind side or behind an heat shield. It would only fail if it has been removed, 99% would pass one that has been hollowed out.



So to update, the mechanic had a look and the grinding noise was just the engine because the covers are missing so it's more pronounced. The dpf was blocked due to incorrect oil so it's getting a service next week. I'm going to see how well it does now and if I get a clogged dpf again then I will hollow it out. Seems the only penny friendly option.
JEROME771 h, 27 m ago

So to update, the mechanic had a look and the grinding noise was just the …So to update, the mechanic had a look and the grinding noise was just the engine because the covers are missing so it's more pronounced. The dpf was blocked due to incorrect oil so it's getting a service next week. I'm going to see how well it does now and if I get a clogged dpf again then I will hollow it out. Seems the only penny friendly option.


Your choice at the end of the day. Dpf's can be a pain but that are there for a reason including carcinogenic fumes that can cause cancer. Most dpf blockages are caused by a fault on the car, anything from a faulty injector, thermostat to a simple air leak. It's an offence to drive a car with the dpf removed, the dvsa are cracking down on it, they are removing mot licenses from mot stations if they advertise dpf removal and developing ways to detect dpf removal for roadside checks and mot's. I actually work as part of a network that specialise in cleaning and curing dpf faults etc. If you are interested I can find the nearest service centre to you, just pm me your postcode and I'll let you know

Anyway, getting far too serious for a Friday, must be nearly time for a beer!
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