# CarDiag AI: OBD2 Scanner — Check Engine Codes Explained

> Check Engine Codes Explained (iPhone/iPad app by RaceMeasure LLC.)

- Source: https://appshunter.io/ios/app/cardiag-ai-obd2-scanner/id6816870332 (this page in markdown: same URL + `.md`)
- Developer: [RaceMeasure LLC](https://appshunter.io/developer/6791293871)
- Category: Utilities, Reference
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 14 MB
- Languages: American English, German (Germany), Russian
- Released: 2026-10-01
- Data updated: 2026-10-02

## What is CarDiag AI?

CarDiag AI turns your iPhone and an ELM327-compatible OBD adapter into a fault code reader with an AI mechanic. Read the codes, see what they mean and get a clear plan for what to check first.

HOW IT WORKS
1. Plug a Wi-Fi or Bluetooth LE adapter (for example, Vgate) into the OBD-II port and switch on the ignition.
2. Connect in the app and choose a scan: engine only (OBD-II) or all modules that answer.
3. Open the report and ask the AI mechanic what it means for your car.

FEATURES
• Fault codes from every module that answers, such as engine, transmission, ABS or airbags, over OBD-II, UDS and KWP2000
• Offline meanings for 9,348 generic codes in English, German and Russian
• Offline VIN decoding: make, country and, where the VIN encodes it, model year; model and engine for many European cars
• AI fault analysis: likely causes, what to check yourself, what the workshop should check and whether it looks safe to drive
• Chat with the AI mechanic by text or voice; it can ask the app to read more data from the car (read-only)
• Claude and GPT models, from quick answers to deep analysis
• Live gauges: up to three OBD values in real time
• PDF reports to share with your workshop
• Clear fault codes on your command, with a readback of what was really cleared
• Scan history on your iPhone
• Demo mode: explore the app without a car

GOOD TO KNOW
CarDiag AI is not a dealer tool. Which modules answer depends on the car, its gateway and your adapter. Manufacturer-specific codes often have no public definition; when the AI interprets one, the app says so. Bluetooth Classic adapters that only show up in iPhone Settings cannot be used by iPhone apps.

PRO AND CREDITS
Free: reading codes, offline meanings, scan history and demo mode.
CarDiag Pro, $4.99 per month or $39.99 once for lifetime access: clearing codes, live gauges and PDF reports.
AI analysis and chat use credits: packs of 100, 500, 1,000 or 2,500 credits for $0.99, $4.99, $9.99 or $24.99. 1 credit = 1 US cent. Each AI request costs twice what the AI provider charges for the tokens it uses: typically 1–10 credits per chat reply and 8–90 per full analysis, depending on the model. Pro Monthly adds 200 credits every month. Credits never expire. Prices are in US dollars; your local price is shown before you buy.

Pro Monthly is an auto-renewable subscription. Payment is charged to your Apple Account when you confirm the purchase. The subscription renews automatically unless you cancel it at least 24 hours before the end of the current period; the renewal is charged within 24 hours before the period ends. Manage or cancel it in your Apple Account settings.

PRIVACY
No sign-up, no ads, no tracking. Scan reports stay on your iPhone. AI features send scan data to our server and to Anthropic and OpenAI only after you agree.

SAFETY
Don't use the app while driving. AI answers are for information and don't replace a qualified mechanic. Clearing codes resets the readiness monitors, so have the fault inspected first.

Terms of Use: https://racemeasureapp.com/cardiag/terms
Privacy Policy: https://racemeasureapp.com/cardiag/privacy
Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| CarDiag Pro Monthly | $4.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| 2,500 AI Credits | $24.99 | one-time |
| 500 AI Credits | $4.99 | one-time |
| CarDiag Pro Lifetime | $39.99 | one-time |
| 100 AI Credits | $0.99 | one-time |
| 1,000 AI Credits | $9.99 | one-time |


## Is CarDiag AI safe?

Not enough ratings yet to assess CarDiag AI.

## Is CarDiag AI legit?

CarDiag AI: OBD2 Scanner appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for CarDiag AI is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-10-01

No release notes.

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All apps by RaceMeasure LLC: https://appshunter.io/developer/6791293871

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-02.*