DPF Light, Flashing Glow Plug Light & Engine Management Light on

[Jockeyblade]

Hi Guys,

I have these lights on the dash and I cant get it checked for a code until after Easter, so I'm wondering if anyone can let me know what to expect.

The car is a 2007 Golf GT 170 with 156k on the clock. I have done most of those miles myself with very few problems. The DPF light has occasionally lit up before at the weekend when I just pop around town. Then when I drive to work (35 miles) it always goes out, and stays out for weeks.

This time it hasn't gone out on a journey and the engine management light has come on and the glow plug light is flashing and it's gone into limp mode. Like I said, as soon as I can I will get it in for a scan, but has anybody else had this issue? could it be a faulty sensor? or a knackered DPF. In my head those are the two extremes. I'm kind of committed to keeping the car for a bit as I've just had the clutch and dual mass replaced, and to be fair it runs like a swiss clock....until now that is.

I have read the sticky, but just wanted to know if anyone has had 1st hand experience of this issue.

Regards
Steve

[j_mack]

My spider senses are saying you need either a dpf clean or replacement

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[Mario]

Had this on my A4 2.0TDI 170 last year, but it all started with a faulty EGR and engine management light. To fix my issue I replaced the EGR (plastic gears were broken, otherwise a clean would have worked), replaced the differential pressure sensor (as a precaution), added Wynns DPF cleaner and topped the tank with diesel, then went out and did a forced DPF regen with VCDS. DPF light has been out since.

In your shoes I would clean the EGR, as there is no need to replace if not broken and do the same as what I did. I think my original DPF sensor was fine, but they are known for failing, so for £50 I replaced it, really easy to access on the A4, bolted to the bulk head.

[j_mack]

Never considered the EGR being at fault, why is this affecting the dpf, my friend had to get a professional clean because the regent didn't work


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[Jockeyblade]

It's the DPF. Would not respond to a forced regeneration so new one being fitted today. £350 + fitting.

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[j_mack]

Did you not consider a professional clean or was in knackered


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[Jockeyblade]

Yes it's knackered.

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[j_mack]

Ouch I'm pleased I don't have one


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[Jockeyblade]

Its my 2nd car it owes me nothing. I have no problem with things wearing out normally. I plan to get it to 300k miles. Just because I can.

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[j_mack]

That's more than to the moon and back, well played I've only done 73k in my gti

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[Sharma1989]

i had a few of these come in to the workshop. Most of the time the DPF pressure sensor was faulty (common) but in this case a regen was required (tried a spare working sensor i had and it was the same) . word of advice, if the DPF light comes on get your car on the motor way as soon as you can drive in 4/5 gear and ensuring you are always above 2000rpm. hopefully the DPF light will go out, it could take up to 30 mins depending on the build up of soot in the filter. if however you do not take your car for a blast when the DPF light comes on you will continue to clog the filter to the point where the Glow Plug light will start flashing and then eml will come on. at this point i am not sure wether the vehicle will go into a regen mode when driven on the motorway as it will be in limp mode (give me just enough power to get to a garage). the vehicle i worked on was at this stage. i checked for fault codes and P2002 Particulate Trap Bank 1 Efficiency Below Threshold - short to circuit B+ was the code and it was not clearable. on my diagnostic tool i was able to perform a forced regen of the DPF after about 15 minutes the glow plug light went off and after another 15 minutes the DPF light went off. take a look at the pics uploaded. soot loading co-efficient was at 60%+ but i hadn't take a picture of before. as i drove it slowly reduced eventually clearing it down to 9.7%. now this vehicle had 150k on the clock, when i was driving after the regen was complete the soot co-efficient was increasing which was not a good sign.From experience i would say that this process would have been done a few times before and a new DPF is probably on the cards as it has become less efficient over the years at doing its job. however it is fixed for now. Hope this helps! Having issues uploading pic not sure if its going to load or not