DPF light on Audi A4 2.0 tdi 2008
Discussion
Hi
I brought a 2008 57 plate Audi A4 2.0 tdi sline convertible 115k full service history , remapped last week , private sale so no warranty.
Drive 12 miles and got the dpf light on ffs.
Had at my local garage for a read which showed no faults .
He did a forced regen , he said it was only saying 6% soot before the regen .
two days latter the light came on again so I did a run down the m42 at 3k rivs until the light went off .
Another 100 miles I came on again so I replaced the dpf sensor with a new one .
I also removed the egr valve to check that , it was solid with soot and cleanly has not working for a very long time , strangely to error code for this or eml.
I cleaned it up like and new and refitted it and went for a spin , the car definitely drove different I could feel it was not pulling as much fresh air in as it was before , letting off the gas at speed the car would now still roll on with little difference , before it would pull back and slow when you take your foot off the peddle .
So I thought it was all fixed and running well until today , the felt sluggish like the turbo was not kicking in then the dpf light came on again .
20 mins down the m42 it’s off again for now but what’s next the try ????
Any help would be greatly appreciated.
I brought a 2008 57 plate Audi A4 2.0 tdi sline convertible 115k full service history , remapped last week , private sale so no warranty.
Drive 12 miles and got the dpf light on ffs.
Had at my local garage for a read which showed no faults .
He did a forced regen , he said it was only saying 6% soot before the regen .
two days latter the light came on again so I did a run down the m42 at 3k rivs until the light went off .
Another 100 miles I came on again so I replaced the dpf sensor with a new one .
I also removed the egr valve to check that , it was solid with soot and cleanly has not working for a very long time , strangely to error code for this or eml.
I cleaned it up like and new and refitted it and went for a spin , the car definitely drove different I could feel it was not pulling as much fresh air in as it was before , letting off the gas at speed the car would now still roll on with little difference , before it would pull back and slow when you take your foot off the peddle .
So I thought it was all fixed and running well until today , the felt sluggish like the turbo was not kicking in then the dpf light came on again .
20 mins down the m42 it’s off again for now but what’s next the try ????
Any help would be greatly appreciated.
What are the readings on the DPF after a new sensor has been fitted?
It has all the symptoms of a blocked DPF. I went through a similar issue with a V50 a few years ago. Blocked DPF was changed but unknowingly had damaged the sensor at same time so within 500 miles, new DPF was also blocked. Needed another DPF and a new sensor. Since then no issues.
It has all the symptoms of a blocked DPF. I went through a similar issue with a V50 a few years ago. Blocked DPF was changed but unknowingly had damaged the sensor at same time so within 500 miles, new DPF was also blocked. Needed another DPF and a new sensor. Since then no issues.
Who remapped it? You can try and get it hot again to regenerate it, but sounds like something more than it just blocking up over time. 100 miles is not long enough for it to be sooting up.
Btw, you dont need to drive at 3000 revs to get it to burn, it should work perfectly well at 60-70mph in 6th, which is about 1800-2000 rpm.
Btw, you dont need to drive at 3000 revs to get it to burn, it should work perfectly well at 60-70mph in 6th, which is about 1800-2000 rpm.
DPF issues should be quite easy to diagnose for a garage familiar with them.
1. Are the sensors working.
2. Take the DPF off & check it is in place & clear.
3. Find out where it was mapped & get the muppets that did it to remove it.
4. Check injectors/egr/breathers are all working correctly.
1. Are the sensors working.
2. Take the DPF off & check it is in place & clear.
3. Find out where it was mapped & get the muppets that did it to remove it.
4. Check injectors/egr/breathers are all working correctly.
Sorry guys the site would not let me reply until today .
Thanks for the info posted .
It’s been back to the garage today for another forced regen but he noticed the ecu doesn’t see the Dpf sensor , here is no reading from it at all .
This is a new sensor
I’ve also spoken to the remap company and there coming to put the original file back on the car at the weekend to se if that fixes the problem.
Thanks for the info posted .
It’s been back to the garage today for another forced regen but he noticed the ecu doesn’t see the Dpf sensor , here is no reading from it at all .
This is a new sensor
I’ve also spoken to the remap company and there coming to put the original file back on the car at the weekend to se if that fixes the problem.
I would think the new sensor would have to be set up, whether the garage's Snap On computer is able to do it I dont know. From your original post it sounded like you just replaced the sensor yourself, which I doubt would work.
The guy who remapped it probably didnt take the DPF out, but had the old owner already taken it out because it was blocked? You probably wouldnt know unless you looked.
The guy who remapped it probably didnt take the DPF out, but had the old owner already taken it out because it was blocked? You probably wouldnt know unless you looked.
We use snap on and hella and snap on sometimes struggles to find things.
Has the garage tried unplugging the sensor to see if something changes, have they checked the wiring ? If a new sensor hasn't fixed the issue and it doesn't need coding either its a wiring issue or they are looking at the wrong sensor.
Has the garage tried unplugging the sensor to see if something changes, have they checked the wiring ? If a new sensor hasn't fixed the issue and it doesn't need coding either its a wiring issue or they are looking at the wrong sensor.
Condi said:
I would think the new sensor would have to be set up, whether the garage's Snap On computer is able to do it I dont know. From your original post it sounded like you just replaced the sensor yourself, which I doubt would work.
The guy who remapped it probably didnt take the DPF out, but had the old owner already taken it out because it was blocked? You probably wouldnt know unless you looked.
I did it myself as videos on how to did it never said it would need setting up with the ecu .The guy who remapped it probably didnt take the DPF out, but had the old owner already taken it out because it was blocked? You probably wouldnt know unless you looked.
The history of the vehicle unknown really , I was thinking a clean software install from Audi maybe better just Incase any previous previous software tampering has been done .
Im trying the obvious things first to Eliminate the problem.
next on the list is to get the new sensor setup with ecu
Then the remark removed .
Then burn the car out ;-(
Edited by Pazman on Tuesday 23 April 19:04
Edited by Pazman on Tuesday 23 April 19:40
Not necessarily, if 'normal' is a 0 reading for the sensor then removing the sensor wouldn't necessarily show a fault.
Your best bet is to ask Audi if the sensor needs coding, if so get the remap removed and the sensor coded to the car, and then go from there. That might sort the issue, it might not, but at least you would know what situation you're working from. All anyone on here can do is guess because nobody has a clue what changes were made when it was remapped, or what work was done on the DPF before you bought it.
Your best bet is to ask Audi if the sensor needs coding, if so get the remap removed and the sensor coded to the car, and then go from there. That might sort the issue, it might not, but at least you would know what situation you're working from. All anyone on here can do is guess because nobody has a clue what changes were made when it was remapped, or what work was done on the DPF before you bought it.
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