Audi A6 Ultra 2.0 TDi 2015 - Ad blue warning message clear - Fixed #
Posted by Phil Cake on April 1, 2019, 12:42 pm
Year of Manufacture: 2015|
Engine Size and Code: 2.0 TDI CNHA
( Optional ) Scanner Used: VCDS
Ill give you the whole job incase it helps, but the part we're at is below the line.
Got an A6 in with Ad blue fault message '600 miles to non start' with codes:
19226 - particulate trap B1 - efficiency below threshold
28653 - reductant system performance 1 malfunction
We cleared the codes but the fault was still displayed on the dash, Live data was all within spec and nothing seemingly at fault. We tried to carry out an SCR metering test and the pump didn't actuate. wiring was checked all ok so we replaced the pump. carried out a battery reset and now the pump actuates on SCR metering test. However, the fault is still live on the dash. We have also driven it 40+ miles since as the car can take this long to register.
So... Weve spoken to RMI technical and they have given us some pretty good info relating to P204F00 (or 28653 as above) as there are similar stories relating to reductant agent system error without event entry, it gives measured values to check - namely SCR inducement DFCC figure at 28.653 - which we have! this figure will bring a fault message on the dash and it gives the following procedure to clear:
'select own check' > drive > engine - additive and subsystems > 01-self diagnosis systems > AC - control unit for reducing agent dosing system J880 > AC - subsystem conditions > effectivness of reducing agent system > 'attach to test plan'
You then precisely complete the test plan to reset the message in the instgrument cluster.
Now the questions are... has anyone had any previous experience with a similar fault and had any joy clearing it? if so, how? (besides any reset/adapt functions in both engine and reductant system ecu as weve been there) does anybody know what program the instructions above are for? (odis?)
Thanks in advance