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Best Engine Code Reader Apps

216+ iOS apps curated and reviewed

4.6 avg rating
20 free apps
Updated June 2026

Looking for free engine code reader apps? 20 of our 216+ tracked titles are free to download — no subscription, no trial. The rest are premium picks worth paying for.

Top Picks for Engine Code Reader

RepairSolutions2#1

RepairSolutions2 by Innova Electronics

Editor's Choice
🔧 Utilities
4.8😊(33K ratings)
FreeIn-App Purchases
RepairSolutions2 screenshot 1
RepairSolutions2 screenshot 2
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RepairSolutions2 screenshot 4
RepairSolutions2 screenshot 5
RepairSolutions2 screenshot 6

This app provides comprehensive vehicle care and repair information for car and truck owners, DIYers, and technicians. It offers diagnostic capabilities with compatible OBD2 scanners and a vast database of verified fixes from ASE Master Technicians. Users can also access free vehicle maintenance information and schedule repairs.

What We Love

  • 👍 Easy to use
  • 🚀 Efficient and fast
  • 💡 Helpful diagnostic features
  • 🤑 Good value for money

Room to Improve

  • 🐛 Connectivity issues
  • 🔍 Limited functionality
  • 🕰️ Slow app performance
Car Scanner ELM OBD2#2

Car Scanner ELM OBD2 by Stanislav Svistunov

The best OBD2 diagnostic tool!
Strong Contender
🔧 Utilities
4.8😊(31K ratings)
FreeAdsIn-App Purchases
Car Scanner ELM OBD2 screenshot 1
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Car Scanner ELM OBD2 screenshot 3
Car Scanner ELM OBD2 screenshot 4
Car Scanner ELM OBD2 screenshot 5
Car Scanner ELM OBD2 screenshot 6

Monitor your car's performance, diagnose engine issues, and view sensor data in real-time. Customize your dashboard with gauges and charts, and reset fault codes. Supports a wide range of vehicles and offers advanced features for specific car brands.

What We Love

  • 🚀 Works great with cheap OBD2 adapters
  • 👍 Highly customizable dashboard
  • 👍 Comprehensive sensor data
  • 👍 Helpful error code lookup

Room to Improve

  • 🐛 Occasional connection issues
  • 🐛 Incorrect sensor readings for some vehicles
  • 🐛 Crashes or freezes on some devices
BlueDriver OBD2 Scan Tool#3

BlueDriver OBD2 Scan Tool by Root Four Imagination Inc.

Fear No Fix™
Worth Considering
📊 Productivity
4.6😊(14K ratings)
Free
BlueDriver OBD2 Scan Tool screenshot 1
BlueDriver OBD2 Scan Tool screenshot 2
BlueDriver OBD2 Scan Tool screenshot 3
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This app turns your smartphone into a powerful OBD2 scan tool. It allows you to read and clear trouble codes, view live data, and generate detailed repair reports for your vehicle. Understand your car's issues and make informed repair decisions.

What We Love

  • 👍 Easy to use
  • 🚀 Excellent diagnostic capabilities
  • 💰 Great value for money
  • 🔍 Detailed fault code information

Room to Improve

  • 🐛 Occasional Bluetooth connectivity issues
  • ⚠️ Limited support for some vehicle makes/models
  • 🚫 Cannot read odometer information

More Engine Code Reader apps to explore

4
FIXD OBD2 Scanner
FIXD OBD2 Scanner
FIXD OBD2 Scanner
Clear Your Check Engine Light
Free

This app translates your car's diagnostic trouble codes into plain language, helping you understand potential issues and their severity. It provides maintenance reminders and offers advanced features like issue forecasting and emissions pre-checks with a premium subscription.

Translate check engine light codesUnderstand issue severityMaintenance reminders
🔧 Utilities
(26K)
free with in-app purchases
5
OBD2 Car Scanner - EOBD Facile
OBD2 Car Scanner - EOBD Facile
OBD2 Car Scanner - EOBD Facile
Torque ELM327 Diagnostic Tool
Free

Transform your smartphone into a professional car diagnostic tool. Read and clear engine fault codes, monitor real-time sensor data, and perform advanced diagnostics without a mechanic. Supports a wide range of OBD2 compliant vehicles.

Read and clear engine fault codesMonitor real-time sensor dataTurn off check engine light
🔧 Utilities
(4.9K)
free with in-app purchases
6
OBD2 Trouble Code
OBD2 Trouble Code
OBD2 Trouble Code
OBD ll Code Reader Guide
Free

Instantly look up your car's check engine codes on the go. Access a vast database of OBD2 codes with descriptions and potential causes for all major manufacturers. Save your search history for quick reference.

OBD2 code lookupCheck engine code descriptionsPossible cause identification
🔧 Utilities
(297)
free
7
Car Scanner | OBD Auto Doctor
Car Scanner | OBD Auto Doctor
Car Scanner | OBD Auto Doctor
OBD2 diagnostics for ELM 327
Free

Diagnose your car's engine light issues and monitor real-time performance data. This app allows you to read and clear diagnostic trouble codes, track fuel consumption, and view sensor data. It's a comprehensive tool for understanding your vehicle's health.

Read and clear OBD2 diagnostic trouble codes (DTC)Reset Check Engine LightMonitor real-time vehicle data and sensor readings
🔧 Utilities
(6.1K)
free with in-app purchases
8
QR Code Reader ·
QR Code Reader ·
QR Code Reader ·
Barcode & QR Code Scanner
Free

Easily scan various QR codes and barcodes to access detailed product information, data cards, and scan history. Organize your scans with folders and export data to CSV. Offers unlimited scans and ad-free experience with a PRO subscription.

Scan 15+ code typesProduct & food detailsQR code data cards
🔧 Utilities
(669K)
freemium
9
QR Code Reader，Barcode Scanner
QR Code Reader，Barcode Scanner
QR Code Reader，Barcode Scanner
QR Code Generator for iPhone
Free

Instantly scan and generate QR codes and barcodes. Compare prices, manage inventory, and create custom codes for various purposes. Supports multiple formats and batch scanning for efficient organization.

Instant QR code and barcode scanningQR code and barcode generationPrice comparison for shopping
🔧 Utilities
(65K)
free with in-app purchases
10
QR Reader for mobile
QR Reader for mobile
QR Reader for mobile
QR Code, Barcode & PDF Scanner
Free

Quickly scan QR codes and barcodes to access information, browse products, and find coupons. Create your own codes and share them easily. Offers advanced features like PIN lock and Siri Shortcuts for enhanced usability.

Scan QR codes and barcodesCreate QR codes and barcodesSupports 25 scanning formats
🔧 Utilities
(9.2K)
free with in-app purchases
11
OBDLink
OBDLink
OBDLink
by OBD Solutions LLC
Free

Transform your phone into a powerful car diagnostic tool. Read and clear trouble codes, monitor real-time engine data, and track fuel economy. Generate detailed reports for easy sharing and analysis.

Read and clear diagnostic trouble codesDisplay real-time vehicle dataCustomizable dashboards
✈️ Travel
(12K)
free with in-app purchases
12
Koder Code Editor
Koder Code Editor
Koder Code Editor
(S)FTP, Dropbox, Webdav, SSH
Free

A powerful code editor for mobile devices, offering syntax highlighting for over 80 languages, remote file access, and a built-in terminal. Perfect for developers who need to code on the go with a well-designed interface.

Syntax highlighting for 80+ languagesRemote file access (SFTP, Dropbox, WebDAV)Built-in SSH client
🛠️ Developer Tools
(9.3K)
paid
13
Barcode Scanners
Barcode Scanners
Barcode Scanners
by Cognex Corporation
Free

This app offers robust barcode scanning capabilities, supporting over 30 different types including QR, UPC, and Data Matrix. It provides powerful parsing for industry-standard formats like driver's licenses and GS1 codes, simplifying data extraction.

Scan over 30 barcode typesQR code scanningUPC scanning
📊 Productivity
(810)
free
14
Regula Document Reader
Regula Document Reader
Regula Document Reader
Read and verify ID documents
Free

Automatically read and verify various identity documents using your device's camera or gallery. It supports OCR, MRZ, RFID chips, and barcodes for rapid, secure, and offline data extraction and validation.

Automatic document type recognitionOCR for visual zone and 70+ languagesMRZ reading and parsing (ICAO 9303, ISO 18013)
💼 Business
(1.4K)
free
15
MotorData OBD ELM car scanner
MotorData OBD ELM car scanner
MotorData OBD ELM car scanner
Car diagnostic. Dashboard.
Free

Transform your smartphone into a comprehensive car diagnostic tool. Read and clear trouble codes, monitor real-time vehicle performance, and customize your dashboard for a deeper understanding of your car's health. Includes free engine diagnostics with optional advanced features for specific brands.

Deep diagnostics for up to 25 ECUsOne-touch scan for trouble codesDecode DTCs and clear Check Engine Light
🔧 Utilities
(723)
free with in-app purchases
16
Mimo: Learn Coding/Programming
Mimo: Learn Coding/Programming
Mimo: Learn Coding/Programming
Code Python, HTML, JavaScript
Free

Learn to code in Python, JavaScript, HTML, CSS, and SQL with AI-assisted development. This app guides you from beginner to building production-ready software and portfolio projects. Master modern developer workflows and launch your career.

Learn Python, JavaScript, HTML, CSS, SQLAI-assisted software developmentBuild portfolio projects
📚 Education
(108K)
free with in-app purchases
17
BimmerLink
BimmerLink
BimmerLink
by SG Software GmbH & Co. KG
Free
$39.99 | 100% OFF

This app provides direct access to your BMW or MINI vehicle's systems. Read and clear trouble codes from all control units, monitor real-time sensor values, and control features like exhaust flaps and active sound design. It also supports battery registration, DPF regeneration, and service resets.

Read and clear trouble codes from all control unitsDisplay real-time sensor valuesRemote control of exhaust flap
📊 Productivity
(7.6K)
free with in-app purchases
18
Code Scanner QR Barcode Reader
Code Scanner QR Barcode Reader
Code Scanner QR Barcode Reader
Read EAN DataMatrix Aztec Bar
Free

Easily scan, read, and decode over 20 types of QR codes and barcodes. Save your scan history, generate custom codes, and view product details. Supports various scanning methods and export options.

Scan 20+ QR code and barcode typesScan from photosGenerate custom QR codes
🔧 Utilities
(640)
free with in-app purchases
19
QR Code Reader and Scanner|
QR Code Reader and Scanner|
QR Code Reader and Scanner|
Easily scan barcode
Free
🔧 Utilities
(1)
20
Thunder Scanner: QR Reader
Thunder Scanner: QR Reader
Thunder Scanner: QR Reader
Scan QR Code, Barcode, AskGPT
Free

This app allows for quick scanning and generation of QR codes for various purposes, including sharing Wi-Fi passwords and event details. It also integrates AI to analyze scanned codes, providing context and summaries for a more insightful experience.

Fast QR code scanningQR code generationAI analysis of scanned codes
🔧 Utilities
(612)
free with in-app purchases