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[raywilb]

does anybody on this forum have any idea where i can get a list of fault codes & the meaning of them for a DS ds 4 . I have tried the french car forums both citreon & ds without luck,  my eml is on & urea warning appeared momentarily, topped it up & it took 15ltrs to fill the tank. initially eml disappeared but has returned.  i will have a look tomorrow & delete any codes, but it would be handy to know if any codes appear what they mean, 

[YZ250]

………..
  i will have a look tomorrow & delete any codes, but it would be handy to know if any codes appear what they mean, 

Assuming that you have a code reader, does it not have a DTC ‘Look Up’ function, so that if a fault code is present/active you can look it up on the code reader. 

[raywilb]

cannot look it up until tomorrow . omitted to say on original post , the car running as it should.

[henryd]

cannot look it up until tomorrow . omitted to say on original post , the car running as it should.

Google is your friend Ray, itll normally de-cypher any code for you

[Marks DTM Calib]

Emissions codes are regulated and have to be standardised, so google should provide the answer.

[raywilb]

cannot look it up until tomorrow . omitted to say on original post , the car running as it should.

Google is your friend Ray, itll normally de-cypher any code for you
[/quote  will give it a go the DS  forum is not a patch on oof. getting UO29D & P200

[STEMO]

U029D - Fault in Communication with the DeNOX system.

https://xenons4u.co.uk/blog/peugeot-citroen-p2200-p220a2-and-u029d-fault-codes-explained/

[Doctor Gollum]

Could that be as simple as needing a DEF refill

[Marks DTM Calib]

Comms fail suggests either the AdBlue ECU is lacking power or has an issue (be it wiring or the ECU itself), so start  by checking wiring and fuses

[Marks DTM Calib]

I should add that all codes should have a suffix which is missing from yours, that would tell us more 

[raywilb]

does anybody on this forum have any idea where i can get a list of fault codes & the meaning of them for a DS ds 4 . I have tried the french car forums both citreon & ds without luck,  my eml is on & urea warning appeared momentarily, topped it up & it took 15ltrs to fill the tank. initially eml disappeared but has returned.  i will have a look tomorrow & delete any codes, but it would be handy to know if any codes appear what they mean, 

Update -  i  cleared both codes & both disappeared for 2 days , UO29D has come back & that reads as  -
  fault in communication with De NOX system , so will have to check that out,  ( not sure where to start looking tho )