# DiagPro: OBD2 DTC & VIN Lookup — Car Diagnostics & Fault Codes

> Car Diagnostics & Fault Codes (iPhone/iPad app by Nguyen Manh Thang.)

- Source: https://appshunter.io/ios/app/diagpro-obd2-dtc-and-vin-lookup/id6801576730 (this page in markdown: same URL + `.md`)
- Developer: [Nguyen Manh Thang](https://appshunter.io/developer/6801576732)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 22 MB
- Languages: American English
- Released: 2026-08-26
- Data updated: 2026-11-06

## What is DiagPro?

DiagPro is the essential pocket diagnostic tool and fault code reference for professional motor mechanics, automotive technicians, and DIY car enthusiasts. Quickly identify why your Check Engine Light is on and decode vehicle identification details in seconds.

Whether diagnosing an engine misfire, catalytic converter warning, or emissions system fault, DiagPro provides instant, accurate fault code explanations and manufacturer-specific definitions.

KEY FEATURES:

◆ Comprehensive OBD-II / DTC Fault Database
• Access over 9,000+ diagnostic trouble codes (both Generic & Manufacturer-Specific).
• Full coverage for Powertrain (P-Codes), with dedicated support for leading marques: Vauxhall/Opel, Ford, Toyota, Honda, Chevrolet, GMC, Buick, and many more.
• Clear, detailed fault descriptions, potential causes, and diagnostic guidance.

◆ Smart Vehicle Identification (VIN & WMI Decoder)
• Decode 17-digit VIN numbers with precision.
• Built-in database of 2,000+ WMI (World Manufacturer Identifiers).
• Instantly identify manufacturer details, country of origin, and vehicle specifications.

◆ Rapid Search & Intelligent Filters
• Filter DTC codes by manufacturer or search directly by code number (e.g. P0420, P0171, P0301).
• Search the WMI database by manufacturer name or country.
• Instant search response with zero lag.

◆ Modern Industrial Workshop UI
• Sleek dark-mode interface tailored for workshop and garage lighting conditions.
• Responsive animations, card-based navigation, and high-contrast typography.

◆ 100% Offline Capability
• Look up critical diagnostic codes on the go—even in basement car parks or remote workshops without mobile reception.

IDEAL FOR:
• Professional Mechanics & Garage Technicians needing a fast, reliable DTC handbook.
• DIY Car Enthusiasts working on home maintenance and track projects.
• Second-hand Car Buyers verifying VIN provenance and checking stored fault codes before purchase.
• Everyday Drivers wanting to understand dashboard warning lights before their MOT or service.

Download DiagPro today and take the guesswork out of vehicle diagnostics!

## Is DiagPro safe?

Not enough ratings yet to assess DiagPro.

## Is DiagPro legit?

DiagPro: OBD2 DTC & VIN Lookup has limited verification signals. The AppsHunter Legitimacy Score for DiagPro is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-08-26

No release notes.

## Apps similar to DiagPro

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [DiagPro+](https://appshunter.io/ios/app/diagpro-plus/id6760949575) | — | Free | Utilities |
| [CarSense: AI Car Diagnostics](https://appshunter.io/ios/app/carsense-ai-car-diagnostics/id6760952816) | — | Free | Utilities |
| [OBD2+](https://appshunter.io/ios/app/obd2-plus/id6808844440) | — | Free | Utilities |
| [Obdia: OBD2 Car Scanner](https://appshunter.io/ios/app/obdia-obd2-car-scanner/id6808010453) | — | Free | Utilities |
| [DiagproAI](https://appshunter.io/ios/app/diagproai/id6745083080) | — | Free | Utilities |
| [OBD2 Car Diagnostics](https://appshunter.io/ios/app/obd2-car-diagnostics/id6768301997) | — | Free | Utilities |

## More apps by Nguyen Manh Thang

- [Hearthsync](https://appshunter.io/ios/app/hearthsync/id6802527468)

All apps by Nguyen Manh Thang: https://appshunter.io/developer/6801576732

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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 2026-11-06.*