DPF Companion

DPF Companion gives you real-time visibility into your diesel particulate filter — so you always know when a regen is coming, when it's happening, and when it's done.

Connect to your vehicle via a Bluetooth OBD-II dongle (Carista EVO recommended) and see live data on a circular dashboard designed for quick glances while driving.

What you can monitor:
Soot loading percentage and actual grams
Regen status with audio alerts when a regen starts, progresses, and completes Estimated time remaining until the next regen or until a current regen finishes DPF inlet and outlet exhaust temperatures
Oil temperature, coolant temperature, and engine RPM
Current speed with colour-coded gradient
Fuel consumption (L/100km or MPG)
Distance and time since last regen
Ash residue and odometer

Key features:
Two dashboard screens — DPF monitoring and Speed/RPM — swipe between them or view both side by side in landscape
Regen history log with duration, soot burned, and average burn rate
Auto-discovery detects which sensors your vehicle supports on first connection Customisable display — toggle inner and outer metric groups on or off
Tap any element on the dashboard for an explanation tooltip
KM or Miles preference
Simulation mode for exploring the app without a vehicle connection
Optional DPF Companion device support (ESP32-S3 dedicated in-vehicle display)

Supported vehicles: Currently optimised for VAG diesel vehicles (Volkswagen, Audi, Skoda, SEAT) with DPF systems from 2008 onwards. Other vehicles may work with limited functionality.

Requirements:
A Bluetooth ELM327-compatible OBD-II dongle (we recommend the Carista EVO)
The dongle must be plugged into your vehicle's OBD-II port
Phone should be kept on charge while using the app (screen stays on with active Bluetooth)

Built by Nifty Noodle.

Recent changes:
• Accurate time remaining — uses real observed soot build rates
• Regen threshold precision
• Companion device improvements — faster auto-connect, handles accessory power gracefully, last-value-wins for thresholds
• Snapshot card — always shows both soot % and time remaining arcs, updates immediately at trip end
• Android Auto parity — same live data display as CarPlay
• Fleet insights — regen fuel impact comparison, route matching for repeat journeys