Carista - hands down. You can see soot levels and initiate a regen at your convenience with Carista - I use it regularly on my 2015 Audi SQ5 as it seems to always want to do a regen at an inconvenient time (eg when you are 5 mins away from home after a 2 hour trip on the freeway). So now I can initiate a regen at a convenient time for me. Carista OBD2 Diagnostic Scanner and Customiser for Android and iOS – AutoInstruct
Carista is $46 to buy, and then full access to the apps features is approx $80 AUD per year.
You can also use the Carista OBD device with another app called VAGDPF which gives you a heap of DPF pressure/temp parameters. The only downside to VAGDPF is that you cannot initiate a regen. VAG DPF app on Android to monitor DPF
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