208 p2202-U029D-U059D 100 miles before start prevented!!!!

[frustrated208]

Hi,

I found this forum after replacing the NOX sensor on our 2016 208 1.6HDi (100ps).

I've read so much about people taking their car to the dealer/specialist only to find that after many £££££ss it appears that the techys didn't really know what the problem was, just replacing stuff at customer's cost until the problem went away.

Background - the codes p2202-U029D-U059D on our 208 were originally cleared but returned after a while with a "your engine will not start after 500 miles" countdown error and the urea light flashing, so after further checking & internet searching and speaking to a couple of friends "in the trade" the best target was NOX sensor, so codes cleared again and NOX sensor replaced. No new errors but "engine will not start" error still present and now at 100 miles (even though we haven't done anywhere near 400 miles).

I read some posts on this forum and 'assuming' the NOX sensor was the faulty item I believe the system needs a kick to let it know it has a new sensor and that it needs to re-initialise.

So the question :- Is Diagbox 9.xx + the Lexia 3 gadget the way to go? does it have the capability to reset the system? (assuming the offending part has been replaced).

[GiveMeABreak]

Probably not.

The unofficial DB 9 software has limited success with anything other than reading codes now as a lot of functionality was removed in favour of 'internet connected mode', It is very hit and miss as to what you can do with a non-official version. The Engine ECU probably needs to be told about the new NOx sensor and possibly needs initialising.

If it isn't done soon then you will likely not be able to start the engine. This is an 'EU' restriction, so have them to blame for that little gem.

I don't know where you went to, but they should easily be able to do this part for the price of a diagnostic - unless of course it is not this and something else. It is not unknown for the pumps in the tanks to fail on these early models and the whole tank needs replacing. So you can't rule that out as a possibility yet.

If the pump isn't working, then the engine ECU may think the Adblue tank is empty, and flag the countdown warning up before engine starting prohibition is engaged.

So these are the 3 possibilities that come to mind - Coding / calibration of the NOx sensor, UREA tank pump failure or something else in the system.

I do know that even on the later 1.5 DW engine, fault U029D needed a new engine ECU software update - so may be a similar issue on your engine.