2 possible reasons:
your engine uses the old diagnostic protocol and the app works only with the last one; in this case there are no possibility to use the app
your engine was never tested by me neither by some user; in this case you can try to use the app using every engine group available (setting it manually in the options menu) looking for some of them who makes readable the 12 parameters
What are the confirmed unsupported engines?
all 1.9 TDI engines
CBDC, CBBB, BMR, CEGA, CBAB, CJAA, CANA, CDYA, CBCD, BRD, BMN, BMP, AVZ, BMA, BKD, BKP, BRE, BSL, BLX, ASB, BKS
How can I understand if my engine ECU uses the old diagnostic protocol VW TP-2.0?
Based on my experience, VW engineers changed the diagnostic protocol about in years 2010-2011, depending on car model and brand.
Probably your ECU uses the old protocol if after the VAG DPF connection process (also in case of errors), pink texts at the bottom of the screen are missing
Why old diagnostic protocol support can't be implemented into the app?
I've tried to analyze the old protocol because I know that many users need to know how their car works after dieselgate scandal, but I've found many problems:
- ELM327 firmware doesn't officially support that protocol (big problem)
- I don't have a car to be used for test and debug (another big problem)
- support and documentation about the protocol are pretty absent, I didn't find any useful website
- my time to spend in android development is reducing day by day and this activity would be enormous
Why some parameters can't be read (showing nd), there is a red dot in the corner of the field and the error counter shows continuos increasing number?
Connecting the app to not fully tested engines or to engines with firmware just updated, some parameters could be unreadable; in this case you can verify if some other engine group lets you read all parameters, but in case no group gives you good results, the better choice is to disable the unreadable parameters clicling on them (field became grayed) to avoid errors and time wasted in every data update cycle.
Why, after working regularly, suddenly the app can't connect to the adapter?
Sometimes after android firmware update or app update, the pairing between the device and the adapter breaks. In this case the best way to solve is unpair the adapter and pair it again in the bluetooth menu of your device; also an app reinstallation can help.
Why my adapter works well with tons of OBD apps but doesn't work with VAG DPF?
Other apps use the OBD2 protocol, my app uses the CANBUS ISO protocol, the same used by the official VW diagnostic tester. Almost all cheap china clone OBD adapter are based on a cracked old ELM firmware, modified to work decently just with ODB2 protocol. This is the reason why they work with all other apps.
VAG DPF requires a good adapter that fulfill the ELM327 firmware specs. Unfortunately, all vendors declare the compliance with all worldwide existing standars for their cheap products, lying shamelessly.
What's a good adapter working with VAG DPF?
Usually I recommend a good quality and not expensive adapter like:
- Vgate iCar 2 Bluetooth (please note that is requires to press a button to be powered on)
- Konnwei KW902
Can this app force a regeneration?
VAG DPF app was developed as a read-only diagnostic tester. This because I want to avoid any kind of problem due to wrong procedures due to mistakes made by user or introduced by programming errors. The forced regeneration is a high risk process because of the risk of fire, I prefer to let this function to real professional softwares.