
About
This app acts as an AI mechanic, interpreting OBD2 fault codes and car service history to identify likely issues. It provides guided checklists and detailed explanations, helping users understand and manage car repairs.
What's New in Pistonly
1.9
September 28, 2026
THE AI ENGINEER, FRONT AND CENTRE The Codes tab now opens with the AI engineer: analyse the car, describe a symptom or a sound, ask about a dashboard light, or explain any code. Your last verdict sits right under it, one tap from the full history. NO CODE? DESCRIBE WHAT YOU NOTICE A knock over bumps, a squeal on a cold start, a sweet smell in the cabin: most problems leave no fault code. Pick what it is, when it happens and where it comes from, add your own words if you like, and the AI engineer tells you what usually causes it on this car, how to check, and whether it is safe to drive. Pistonly doesn't record audio: you describe the sound, just as you would to a mechanic on the phone. CHOOSE WHAT TO ANALYSE Every code found on the car, or in the module results, has a checkbox. Analyse them all together, or only the ones you pick. Tap a code itself to open it in full, with its own AI explanation. EXPLAIN ANY CODE Type a code from a dealer report or another scanner and get the database entry plus an AI explanation for your car. No adapter needed. THE AI ENGINEER IS NOW PART OF PRO Every AI feature, from verdicts and symptoms to dashboard lights and oil advice, now comes with Pro. Your saved verdicts, the code database with its can-I-drive verdicts, recalls and the rest of the free tools stay free. With your own Claude or Perplexity key the AI works without Pro. MORE CARS Manufacturer profiles for 216 models, all inside the app and working offline. The car catalog gained ten makes, including Cupra, MG, Polestar, Zeekr and Li Auto, and around a hundred models, with duplicate entries cleaned up. FIXES • When the AI couldn't answer and offline rules stepped in, there was no way back to the AI. The result now has a button to ask again. • Every re-run of a diagnosis is saved to the history, and a verdict reopened from the cache no longer appears there twice. • On a car used once, module reads could use the addresses of the car selected in the garage, and codes of a previous car could stay on screen. Both fixed. • A car used once warns that its verdicts are kept only until you close the app, and can be saved in one tap. • When our AI service is down, the message says so plainly. • If the adapter doesn't answer, for example asleep with the ignition off, the app no longer shows "Connecting…" forever: it gives up after 15 seconds and says why. ALSO • Every window has a close button in the top right. • Instruments moved into Tools, and every tab has the same header. • "Read the modules" sits right under the AI engineer. • Clearer names: inspection readiness, explaining a dashboard light. • In the diagnostician's interview, yes and no answers can take a few words of detail.
MoreSubscriptions & In-App Purchases
Pistonly Pro — Monthly
Unlimited AI diagnoses and every pro tool.
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FAQ
What is Pistonly?
Pistonly is an AI-powered car diagnostics app that reads OBD2 fault codes, analyzes your car's service history, and provides likely causes and repair checklists. It aims to simplify car maintenance for users.
How does Pistonly's AI diagnostician work?
You add your car by VIN, input fault codes, and the AI analyzes this data along with your service history to rank likely causes and generate a guided checklist. It learns from your input as you tick off fixes.
Can Pistonly read codes from any OBD2 scanner?
Yes, Pistonly can read fault codes from any OBD2 scanner or diagnostic report. You can also manually enter codes if you don't have an adapter.
What features are included in the free version of Pistonly?
The free version offers 3 AI analyses per month, fault-code reading with plain-English descriptions, a garage and service book, control unit browsing, live sensors, Mode 06, readiness checks, and an acceleration test.
What are the benefits of Pistonly Pro?
Pistonly Pro provides unlimited AI diagnoses, a drive log for AI sensor analysis, odometer rollback checks, service functions like actuator tests and resets, enhanced PIDs, and CSV data logging. It also supports multiple cars.
Does Pistonly have ads?
No, Pistonly does not have advertisements. The app offers a free tier with limitations and a premium subscription for full access.
What devices does Pistonly support?
Pistonly is available on iPhone and iPad devices, running on iOS.
How often is Pistonly updated?
Pistonly was last updated on July 31, 2026, with version 1.2. The release date was July 21, 2026.








