P2002 Code - Impossible Solution - HELP

[RocketAudi]

2015 Audi A3 8V 1.6tdi Sport back, totally stock, >100k Miles

P2002 Present and repeating for the last 12 months.

- DPF cleaned, regenerated and fully inspected. Currently sitting at 50% and all other metrics are well below flagging P2002 code (soot / ash etc..)

- Both pressure sensors replaced with brand new OEM. Properly reset to system ECU and 'learnt'

- No noticeable drop in performance, no limp mode and still pulls very well. Car is also still performing regen

- No nasty smoke or running issues

- When code removed, it comes back after approximately 100 miles (always the same P2002, and never any change in performance)

This is absolutely driving me mad, i cannot find the source of the P2002 EML and cant bring myself to do another round of garage trips. Has any body at all had this issue and managed to find a resolve? Or has had a source of P2002 code that's not listed above?

Thanks

 

[ChatYTB]

2015 Audi A3 8V 1.6tdi Sport back, totally stock, >100k Miles

P2002 Present and repeating for the last 12 months.

- DPF cleaned, regenerated and fully inspected. Currently sitting at 50% and all other metrics are well below flagging P2002 code (soot / ash etc..)

- Both pressure sensors replaced with brand new OEM. Properly reset to system ECU and 'learnt'

- No noticeable drop in performance, no limp mode and still pulls very well. Car is also still performing regen

- No nasty smoke or running issues

- When code removed, it comes back after approximately 100 miles (always the same P2002, and never any change in performance)

This is absolutely driving me mad, i cannot find the source of the P2002 EML and cant bring myself to do another round of garage trips. Has any body at all had this issue and managed to find a resolve? Or has had a source of P2002 code that's not listed above?

Thanks

It would be nice if you would show VCDS results
Is it like this below ?
In reality if ou saying u had dpf "cleaned" but u didn't see it how they "cleaned ut then most likely your dpf isn't clean and plus egr too..
If they just sticked some pointless plastic hose thin pipe for couple of minutes it is not "clean" whatever ..
The cars mostly tdi get its filter too much blocked and some hise pipe gas pushing through will not clean dpf whatsoever ...
I gave car to some garage to clean dpf and egr but they didn't remove it and blast cleaned it they lied and took £100..
The sensors never gets faulty less likely ...
Plus u need to check the pipes which are connected to those two dpf sensors
Best thing is to remove dpf filter close the shell and have it software modified then only errors will never comes back

 

[RocketAudi]

It would be nice if you would show VCDS results
Is it like this below ?
In reality if ou saying u had dpf "cleaned" but u didn't see it how they "cleaned ut then most likely your dpf isn't clean and plus egr too..
If they just sticked some pointless plastic hose thin pipe for couple of minutes it is not "clean" whatever ..
The cars mostly tdi get its filter too much blocked and some hise pipe gas pushing through will not clean dpf whatsoever ...
I gave car to some garage to clean dpf and egr but they didn't remove it and blast cleaned it they lied and took £100..
The sensors never gets faulty less likely ...
Plus u need to check the pipes which are connected to those two dpf sensors
Best thing is to remove dpf filter close the shell and have it software modified then only errors will never comes back

Kicking myself now, but i never got the screenshots. Will try contact and get them back.
RE the 'Clean' it was an overnight soak, however the stats were: Oil Ash (37.9g), Oil Ash Volume (0.09L), Oil Ash Mass limit (80g), Oil Ash Volume Limit (0.2L) therefore by stats the DPF is actually within operational limits. This has also been happening for the last 12 months, so if the DPF was blocked i would have expected a performance drop & limp mode of which i have had neither.

As a matter of course i had the DPF pressure sensors replaced and re-learnt. It seems bizarre i have had no functional change and all DPF diagnostics are saying its OK

 

[ChatYTB]

Kicking myself now, but i never got the screenshots. Will try contact and get them back.
RE the 'Clean' it was an overnight soak, however the stats were: Oil Ash (37.9g), Oil Ash Volume (0.09L), Oil Ash Mass limit (80g), Oil Ash Volume Limit (0.2L) therefore by stats the DPF is actually within operational limits. This has also been happening for the last 12 months, so if the DPF was blocked i would have expected a performance drop & limp mode of which i have had neither.

As a matter of course i had the DPF pressure sensors replaced and re-learnt. It seems bizarre i have had no functional change and all DPF diagnostics are saying its OK

It can be done by adjusting values .. It is just alarm that sensor treshold is over limit..I can leave it on for days it isn't big issue .. But yeah annoying when light is on on dash..I have slightly different issue as one mechanic broke that plastic nozzle where hose pipe is attached and he only super glued it and he blocked it wrongly put it back and after 3 months I had melted whole senor including connector with 3 wires .. So I ordered new pre wired connector and sensor (the second sensor was intact) soldered 3 wires but when I step on it suddenly for high rpm it then shows management light diffential sensor but says "intermittent' means when high rpm are applied the sensor like stopps working or it receives high signal which will cut the sensor off.. And now am not sure if it's done be exhaust fumes or by wires been soldered ... I think when u saying sensor need to be calibrated mine hasn't been ...
But when I am driving under 100 mph or slow not sudden fast accelerate, the problem never occurs..

 

[RocketAudi]

It can be done by adjusting values .. It is just alarm that sensor treshold is over limit..
I can leave it on for days it isn't big issue .. But yeah annoying when light is on on dash..
I have slightly different issue as one mechanic broke that plastic nozzle where hose pipe is attached and he only super glued it and he blocked it wrongly put it back and after 3 months I had melted whole senor including connector with 3 wires .. So I ordered new pre wired connector and sensor (the second sensor was intact) soldered 3 wires but when I step on it suddenly for high rpm it then shows management light diffential sensor but says "intermittent' means when high rpm are applied the sensor like stopps working or it receives high signal which will cut the sensor off.. And now am not sure if it's done be exhaust fumes or by wires been soldered ... I think when u saying sensor need to be calibrated mine hasn't been ...

Thats interesting, maybe i'll just do that lol - even the specialist near me its been to is scratching his head.

Yea if you have replaced the DPF pressure sensors then you will need to tell the ECM to 're-learn' the values, you then drive as normal and it will play around for a few days while the ECM learns the pressure pattern VS engine data (Revs / pressure etc..) and reset the EML with new values. If you dont re-learn the new pressure sensor then the pressure reading will always be offset with an error compared to true value

 

[ChatYTB]

Thats interesting, maybe i'll just do that lol - even the specialist near me its been to is scratching his head.

Yea if you have replaced the DPF pressure sensors then you will need to tell the ECM to 're-learn' the values, you then drive as normal and it will play around for a few days while the ECM learns the pressure pattern VS engine data (Revs / pressure etc..) and reset the EML with new values. If you dont re-learn the new pressure sensor then the pressure reading will always be offset with an error compared to true value

Best process

 

[RocketAudi]

Best process

I agree but my point being that my DPF is not clogged, its not empty but is nowhere near the threshold of blocking / causing problems or requiring heavy cleaning

 

[ChatYTB]

I agree but my point being that my DPF is not clogged, its not empty but is nowhere near the threshold of blocking / causing problems or requiring heavy cleaning

How do I ''learn'' that sensors or calibrate?

 

[RocketAudi]

How do I ''learn'' that sensors or calibrate?

You do it through the VCDS - its pretty straight forward through there if you have a a reader with a nice UI

 

[ChatYTB]

Yeah I have I shown on top
So in engine section then where

You do it through the VCDS - its pretty straight forward through there if you have a a reader with a nice UI

Yeah I show in post above I have vcds
Look here pics where next to check it?