DPF Companion

Monitor your diesel particulate filter in real-time. Know when regens happen, track soot levels, and keep your DPF healthy — with CarPlay support.

DPF Companion is a real-time diesel particulate filter monitoring app for diesel vehicle owners. Connect to your vehicle via a Bluetooth OBD-II dongle and get instant visibility into your DPF health, regeneration status, and engine performance.

KEY FEATURES:

• Live DPF Monitoring — Track soot loading in real-time with a visual gauge showing percentage and grams. Know exactly when your next regeneration will occur.

• Regen Countdown Timer — Estimates minutes remaining until your next DPF regeneration starts, or until an active regen completes. Never be caught mid-regen on a short trip again.

• Smart Vehicle Alerts — Notifications when a regen is approaching, when one is predicted based on your driving pattern, when fuel efficiency drops, and when your device needs syncing.

• Trip Recording — Automatic trip detection with GPS routes, fuel consumption, driving style analysis, and distance tracking. Works with phone connected or standalone device.

• Multi-Vehicle Support — Automatically detects and tracks multiple vehicles. Each vehicle maintains its own trip history, regen data, and health scores.

• DPF Health Dashboard — Overall health score based on regeneration patterns, soot trends, and driving habits.

• Fault Code Scanning — Read diagnostic trouble codes from all vehicle ECUs. Read-only — never writes to your vehicle.

• Fleet Insights — Compare your vehicle's DPF performance against other vehicles.

• CarPlay — View DPF status, soot levels, and regen countdown directly on your car's built-in display.

• Companion Device — Optional ESP32 hardware device that mounts in-vehicle for a dedicated always-on DPF display with buzzer alerts. Buy the hardware directly from Waveshare for ~€25 and flash it yourself using our free web flasher.

• Pay What Is Fair — Voluntary support option. The app is fully functional regardless. If it helps you, consider supporting continued development.

SUPPORTED VEHICLES:

DPF Companion works with Volkswagen Group (VW, Audi, Skoda, SEAT) diesel vehicles equipped with a DPF. The app automatically discovers your vehicle's sensors on first connection — no manual configuration required.

Supported engine codes include: CAAC, CAGA, CAHA, CAPA, CAYA, CAYB, CAYC, CCWA, CFCA, CFFB, CFGB, CFGC, CFHA, CFHC, CFHD, CFJB, CFWA, CGLB, CGLC, CJCA, CJCB, CJCD, CLAB, CLHA, CNHA, CNHC, CRKB, CRLB, CRMB, CRUA, CSHA, CUAA, CUDC, CUNA, CUPA, CUSA, CUSB, CUTA, CUUB, CUWA, CVUA, CVUB, CVUC, CXBA, CXEB, CXEC, CXFA, CXGA, CXGB, CXHA, CXHB, CXHC, CXXA, CXXB, CZZA, DAUA, DAVA, DBGC, DCBC, DCBE, DCXA, DDWA, DETA, DEUA, DEUC, DEWA, DEZE, DFBA, DFCA, DFEA, DFFA, DFGA, DFHA, DFLA, DFLB, DFSB, DFSD, DFSF, DFYA, DGDA, DGDB, DGTE, DGTC, DGTD, DHXA, DJGA, DLUB, DMMA, DMZA, DMZB, DNAA, DNAB, DNAC, DSRA, DSRB, DSSA, DSTB, DTNA, DTPA, DTPB, DTRA, DTRD, DTRB, DTRC, DTRE, DTSA, DTSB, DTUA, DTTA, and others.

If your engine code isn't listed or sensors aren't detected, the app will let you know what works and offer to contact support. Trip recording, fault codes, and basic engine data remain available for all vehicles.

REQUIREMENTS: • Bluetooth Low Energy ELM327-compatible OBD-II dongle (e.g., Carista EVO, Vgate iCar Pro) • Diesel vehicle with DPF (Volkswagen, Audi, Skoda, SEAT) • iOS 16.0 or later

The app includes a Simulation Mode for exploring all features without vehicle hardware.