Your diagnostic conversation is no longer locked to the device that did the scan.
I scanned my Explorer in the driveway. Asked ARIA about fuel trims. Got her analysis on my phone.
Then I walked inside, opened my laptop, and asked her a follow-up question.
She remembered everything.
ARIA Web Chat is live for PRO subscribers. Open dashboard.obdai.app, click into any scan session, and continue the conversation you started on your phone.
Same vehicle context. Same diagnostic history. Same AI. Different screen.
This is the feature that closes the loop on the OBDAI platform story. If you watched the Part 1 and Part 2 tutorials, you saw how to scan a vehicle, run a drive test, and generate reports. But the chat stayed on the phone. Not anymore.
Let me walk you through what this actually looks like. I’m using my 2017 Ford Explorer Limited as the test vehicle — 10 scan sessions over the last few months, all stored in OBDAI.
I connected the Gen 2 scanner, opened OBDAI on my phone, and told ARIA I wanted to run a drive test.
She immediately pulled up the current vehicle state:
| Item | Current Status |
|---|---|
| MIL / Check Engine Light | Off |
| Stored DTCs | None |
| Pending DTCs | None |
| Coolant Temp | 87 °C |
| Vehicle Speed | 0 mph |
| MAP | 47 kPa |
| Relative Throttle | 3.1% |
Then she recommended a specific set of PIDs for a general performance test:
| PID | What it shows | Why it matters |
|---|---|---|
| 0x04 | Calculated Engine Load | Shows how hard the engine is working |
| 0x06 | Short Term Fuel Trim Bank 1 | Catches live mixture corrections |
| 0x07 | Long Term Fuel Trim Bank 1 | Shows learned fueling bias |
| 0x0C | Engine RPM | Essential reference for all other data |
| 0x0D | Vehicle Speed | Lets me correlate behavior with road conditions |
| 0x0E | Timing Advance | Helps spot spark control issues |
| 0x0F | Intake Air Temp | Useful for airflow and heat-soak analysis |
| 0x10 | Mass Air Flow | Great for load and breathing analysis |
| 0x11 | Throttle Position | Confirms driver demand vs engine response |
| 0x0B | MAP | Helps interpret engine load and airflow |
ARIA explained why this set works: “This group gives me the full story on airflow, fueling correction, throttle input, engine load, spark behavior, and response under acceleration and cruise.”
She even suggested a drive route:
I tapped “Set it up for me” and ARIA added 9 PIDs to the live stream automatically:
| PID | Description | Status |
|---|---|---|
| 0x04 | Calculated Engine Load | Added |
| 0x06 | Short Term Fuel Trim Bank 1 | Added |
| 0x07 | Long Term Fuel Trim Bank 1 | Added |
| 0x0C | Engine RPM | Added |
| 0x0D | Vehicle Speed | Added |
| 0x0E | Timing Advance | Added |
| 0x0F | Intake Air Temp | Added |
| 0x11 | Throttle Position | Added |
| 0x0B | MAP | Added |
She noted that PID 0x10 (MAF) wasn’t supported by this vehicle, so she left it out. No problem — she can do a strong analysis with MAP, throttle, load, RPM, and fuel trims.
Then she told me what she’d be watching for:
I drove for a few minutes — mixed city driving, some acceleration, some coast-down. Then I came back and asked ARIA to analyze the data.
Here’s what she found:
| Item | What I saw | My take |
|---|---|---|
| Stored / Pending Codes | None | No active fault detected |
| Coolant Temp | 87-89 °C | Fully warmed up, normal |
| Vehicle Speed | 0-44 mph | Valid mixed driving sample |
| STFT Bank 1 | Avg -0.8%, range -16.4% to +6.25% | Mostly normal, brief decel enrichment/lean correction swings are expected |
| LTFT Bank 1 | Avg +0.68%, range -6.25% to +3.13% | Excellent long-term fueling |
| MAP | 20-97 kPa | Good spread from coast/idle to load |
| Timing Advance | -10° to 38° | Broad but believable for mixed low-speed driving |
| Throttle Position | 14.1-59.2% | Normal response to driver input |
| Engine Load | 16.5-98.4% | Responsive and plausible |
| Intake Air Temp | 54-63 °C | Warm underhood air, not automatically a fault |
Strong signs:
Minor observations:
ARIA’s diagnosis: No evidence of a significant vacuum leak, major fuel delivery issue, obvious ignition timing trouble, or a sensor failure severe enough to trigger drivability alarms.
She offered follow-up options based on specific symptoms:
That drive test happened on March 28th. The conversation stayed in my phone. Done, right?
Wrong.
Today — April 5th — I opened dashboard.obdai.app on my laptop, navigated to that session, and clicked “Chat with ARIA.”
The entire conversation loaded. Every message from the mobile app was there, with a clear “Continued on dashboard” divider marking where the web conversation begins.
I asked ARIA: “Hi ARIA, tell me about this vehicle.”
She responded with a full vehicle snapshot:
🚙 Vehicle Overview
| Year/Make/Model | 2017 Ford Explorer Limited |
| Engine | 3.5L V6 Ti-VCT Gasoline |
| Drivetrain | FWD (Front-Wheel Drive) |
| Transmission | Not specified, likely 6-speed automatic |
| Body Style | SUV, 4-door, 3 rows, 7 seats |
| Power | 290 HP |
| Assembly | Chicago, Illinois, USA |
| Trim | Limited |
🌟 Key Features & Safety
📝 Bottom Line: Your 2017 Ford Explorer Limited is a well-equipped, 3-row, family-friendly SUV with strong safety technology and a reliable 3.5L V6 engine.
Then I asked the question that no scan tool can answer: “Compare this test and the previous test.”
ARIA pulled up the March 28th drive test (current) and the March 18th drive test (previous) and built a comparison:
| Metric | 2026-03-28 (Current) | 2026-03-18 (Previous) |
|---|---|---|
| Codes/MIL | No codes, MIL OFF | No codes, MIL OFF |
| Coolant Temp (avg) | 87.9 °C | 88.0 °C |
| MAP (avg) | 50.0 kPa | 55.2 kPa |
| RPM (avg) | 924 | 1,029 |
| Speed (avg/max) | 9.0 / 44 mph | 11.9 / 47 mph |
| Engine Load (avg) | 49.8% | 53.6% |
| STFT Bank 1 (avg, min) | -1.5% (min -16.4%) | -0.4% (min -12.5%) |
| LTFT Bank 1 (avg) | +1.7% | -1.7% |
| Timing Advance (avg) | 9.6° | 15.0° |
| Throttle Pos. (avg/max) | 17.2% / 59.2% | 17.7% / 30.2% |
🔎 Key Differences & Insights:
🏁 What stayed consistent:
Summary Table: Direct Metrics
| PID | Mar 28 (Now) | Mar 18 (Prev) |
|---|---|---|
| Coolant Temp (°C) | 87-89 | 87-89 |
| MAP (kPa) | 20-97 | 21-97 |
| RPM | 584-2,988 | 600-3,562 |
| Speed (mph) | 0-44 | 0-47 |
| Engine Load (%) | 16-98 | 16-88 |
| STFT (%) | -16.4 to +6 | -12.5 to +6 |
| LTFT (%) | -6.2 to +3 | -4.6 to +0.7 |
| Timing (°) | -10 to +38 | -10 to +42 |
📝 Bottom Line: Performance is stable: no engine, fuel, or sensor problems are emerging over time, and there’s excellent emissions compliance. Minor data differences reflect normal drive cycle variance — not new trouble.
A scan tool reads codes. It shows you numbers. Maybe it has a database lookup.
ARIA:
The conversation I had on my phone in my driveway on March 28th picked up seamlessly on my laptop in my office on April 5th. ARIA knew the vehicle, knew the history, knew what we’d already discussed.
That’s not a feature. That’s a different category of product.
PRO subscribers: Full access. Chat with ARIA on the web, ask unlimited questions, use all tools.
Premium subscribers: You can open the chat panel and see the full conversation history from your mobile session (read-only). To continue the conversation, you’ll need PRO.
If you’re already a PRO subscriber:
If you’re not PRO yet — this is what $299/year gets you.
This feature builds on the workflow covered in our tutorial series:
ARIA Web Chat is the third piece: the diagnostic conversation that follows you everywhere.
Scan in the bay. Analyze at the desk. ARIA follows you.
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