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DPF Won't regen and engine code P2002 is staying in the system

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25K views 18 replies 5 participants last post by  amfalconer  
#1 ·
Last Friday my check engine light came on and the car went into limp mode so I plugged in my OBD2 Scanner and it came up with a P2002 Fault Code (Diesel Particulate Filter Efficiency Below Threshold Bank 1) so I assumed I needed to give the car a blast, so I did and I held the car in 4th at 3krpm (wouldn't go any higher anyway) at 60mph trying to trigger a regen. That didn't solve the issue nor did clearing the code as the light would come back on after about a minute of driving so I took it into college to see if maybe my cheap scanner isn't picking up other codes - it showed up then with P0683 (Glow Plug Duration Control Signal Invalid) and P1206 (Particulate filter system particulate mass too high). So this morning I finally got round to sorting my glowplug issue (I had 3 as one of them was snapped and 2 of the old ones which were also snapped kindly removed themselves) so now it has all 4 working glow plugs and to my knowledge the P0683 code has gone thanks to the 'Pre-Heating Plugs Not Available' message not showing whenever I put the key in now. Just got back from an hour long drive, again keeping it in 4th at 60-70mph at 3krpm only to have the P2002 code still present and the car still in limp mode. I have it booked in for a DPF Flush tomorrow, could there be any other causes for this? I know my EGR isn't blanked and my swirl flap bar is broken, being a student it'll be a couple weeks before I can sort the swirl flap issue, any advice or knowledge on this is much appreciated!
 
#4 ·
Be interesting to know how Halfords do a DPF flush and how long it took them.......personally I would not trust the average 13 year old Halfords mechanic to inflate my tyres correctly....but that's just me!!
 
#5 ·
One thing i have learned over the last few days is use multi ecu scan to read codes , multiple (expensive) scanners would give me partial codes or incorrect definitions or just not show the codes at all , you can also force a regen with that , people may disagree with my opinion here but any type of flush Halfords will perform is not going to unblock a dpf
 
#6 ·
Well tbf it doesn't seem to have done the job at all, I took it for another blast after the 'flush' only for the Engine Management Light to come back, I have noticed that the dash doesn't say 'Anti-Pollution Filter Blocked' like it has done in the past, I'll look into MultiECU Scan now but could it be that the P2002 code isn't coming up bc the DPF is actually blocked? I know my swirl flaps are in desperate need of attention and after a bit of research that might be the problem? I'm still only a student in mechanics so forgive my crappy explanations!
 
#7 ·
Swirl flaps shouldn't throw an error unless the actuator is unplugged.

I suspect your Halfords job was to chuck a can of DPF cleaner in the fuel tank, rather than take it off and wash it out.
 
#11 ·
Flexi section?

Can't say it is causing your issues, but certainly.wont be helping things.

Where are you located? Someone local may have the dish tools to see what your codes mean and possibly force a dpf regen.
 
#12 ·
I had a garage fit a new flexi section not too long ago, found out the hard way that they were dodgy and they even took the SD Card out my dashcam and I’ve not seen it since… Just done my best to seal the exhaust with some Holts Firegum I had left over from a previous car, letting that dry now with fingers crossed.

I’m not far from Birmigham Airport if thats any help
 
#13 ·
Sadly I'm a little far away to be of any help, I'm on the south coast, hopefully your temp fix works, but suspect that it won't cure your dpf issues.

Whilst you're under there, can you check the hose coming from the DPF up into the engine bay, this is goes to the pressure sensor and have been known to split.
 
#14 ·
Funny you say that, I do have a hose connector that doesn't have a hose connected to it (first image) and the hose I think you're talking about does seem to have a lot of slack in it (second image) which does seem a bit odd to me.
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#16 ·
As above, that's a coolant line I think.

There is a lot of slack on that hose, it should lead to a sensor fixed to the bulkhead, (see below) I'm guessing possible that your dodgy exhaust shop may not have re-connected or otherwise damaged it.

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