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Best Diagnostic Tool To Check Engine Light Apps

221+ iOS apps curated and reviewed

4.1 avg rating
19 free apps
Updated June 2026

From beginner-friendly picks to power-user tools, our diagnostic tool to check engine light list covers 221+ iPhone apps updated through June 2026. Compare ratings, prices, and screenshots in one place.

Top Picks for Diagnostic Tool To Check Engine Light

FIXD OBD2 Scanner#1

FIXD OBD2 Scanner by FIXD Automotive Inc

Clear Your Check Engine Light
Editor's Choice
🔧 Utilities
4.6😐(26K ratings)
FreeAdsIn-App Purchases
#44in Utilities
FIXD OBD2 Scanner screenshot 1
FIXD OBD2 Scanner screenshot 2
FIXD OBD2 Scanner screenshot 3
FIXD OBD2 Scanner screenshot 4
FIXD OBD2 Scanner screenshot 5
FIXD OBD2 Scanner screenshot 6

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.

What We Love

  • 👍 Easy to use
  • 🚀 Quickly identifies problems
  • 💰 Saves money on mechanics
  • 🔍 Provides detailed diagnostic information

Room to Improve

  • 🔒 Requires subscription for full functionality
  • 💰 Expensive premium subscription
  • 🤖 Inconsistent performance across vehicles
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
Car Scanner ELM OBD2 screenshot 2
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
RepairSolutions2#3

RepairSolutions2 by Innova Electronics

Worth Considering
🔧 Utilities
4.8😊(33K ratings)
FreeIn-App Purchases
RepairSolutions2 screenshot 1
RepairSolutions2 screenshot 2
RepairSolutions2 screenshot 3
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

More Diagnostic Tool To Check Engine Light apps to explore

4
BlueDriver OBD2 Scan Tool
BlueDriver OBD2 Scan Tool
BlueDriver OBD2 Scan Tool
Fear No Fix™
Free

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.

Read and clear trouble codes (Check Engine, ABS, etc.)Generate professional-grade Repair ReportsAccess Mode 6 and smog readiness data
📊 Productivity
(14K)
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
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
7
Torque OBD Lite - Car Scanner
Torque OBD Lite - Car Scanner
Torque OBD Lite - Car Scanner
Obd2 car scan diagnostic tool
Free

This application allows users to diagnose their car's performance in real-time. By connecting an OBD2 Bluetooth adapter, users can easily communicate with their vehicle and access essential diagnostic widgets. It supports a wide range of OBDII protocols for comprehensive car communication.

Real-time car diagnosticsOBD2 Bluetooth adapter connectivityPopular and necessary widgets
✈️ Travel
(254)
free with in-app purchases
8
OBD2 Scanner: Torque ELM 327
OBD2 Scanner: Torque ELM 327
OBD2 Scanner: Torque ELM 327
Torque OBD2 Car Scanner ELM327
Free

Transform your smartphone into a powerful car diagnostic tool. Monitor real-time engine data, read and clear trouble codes, and track your vehicle's performance. Customize your dashboard and access repair manuals to understand and fix issues.

Real-time engine data monitoringRead and clear trouble codesPerformance tracking
🔧 Utilities
(802)
free with in-app purchases
9
ThinkDiag+
ThinkDiag+
ThinkDiag+
by THINKCAR INC
Free

This app provides professional-level vehicle diagnostics, offering features like reading/clearing fault codes, data flow analysis, and special maintenance functions. It supports a wide range of car brands and allows users to subscribe to specific diagnostic software. Connects via Bluetooth to your smartphone for intelligent vehicle analysis.

OE-level diagnostic functionsFull OBD II diagnosisSpecial maintenance functions
🔧 Utilities
(4K)
free with in-app purchases
10
OTR Diagnostics
OTR Diagnostics
OTR Diagnostics
Heavy-duty scan tool made easy
Free

This app helps heavy-duty truck owners diagnose and resolve common issues like fault codes, regen problems, and derates. It provides plain-language explanations of error codes, allows for bi-directional commands to fix issues, and monitors live truck data to prevent downtime.

AI-powered fault code explanationBi-directional commands for repairsReset active/inactive fault codes
🔧 Utilities
(96)
free with in-app purchases
11
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
12
OBDeleven – OBD2 car scanner
OBDeleven – OBD2 car scanner
OBDeleven – OBD2 car scanner
Diagnostics, service & coding
Free

Transform your smartphone into a powerful car diagnostic and customization tool. Easily scan trouble codes, monitor live data, and access advanced features like coding and service functions for a wide range of car brands. Save time and money on car maintenance and personalization.

Basic OBD2 diagnosticsLive data monitoringAdvanced diagnostics for licensed brands
🔧 Utilities
(1.1K)
free with in-app purchases
13
inCarDoc OBD2 ELM327 Scanner
inCarDoc OBD2 ELM327 Scanner
inCarDoc OBD2 ELM327 Scanner
Car diagnostics, obd2 scanner
Free

This app acts as a car diagnostic tool, allowing users to scan fault codes, monitor real-time engine parameters, and log vehicle maintenance. It helps optimize car performance and control fuel consumption by accessing ECU data.

OBD2 fault code scannerReal-time parameter monitoringLogbook for diagnostics and maintenance
✈️ Travel
(152)
free with in-app purchases
14
ZUS - Save Car Expenses
ZUS - Save Car Expenses
ZUS - Save Car Expenses
ZUS Smart Driving Assistant
Free

This app helps you save money on car expenses by offering cash rewards for driving, diagnosing and clearing engine error codes, and providing DIY repair guides. It also assists in reducing car insurance costs and tracking mileage.

Earn cash rewards for drivingRead and clear check engine lightError code diagnosis and repair guide
🔧 Utilities
(5.2K)
free with in-app purchases
15
Xtool Anyscan
Xtool Anyscan
Xtool Anyscan
OBD Diagnostic
Free

This smart diagnostic system connects to your iPhone or iPad to provide on-demand vehicle diagnostics. It offers comprehensive coverage for a wide range of car makes and includes full system diagnosis with various special functions.

Comprehensive vehicle coverageFull system diagnosisSpecial functions
🔧 Utilities
(70)
free
16
Infocar - OBD2 ELM Scanner
Infocar - OBD2 ELM Scanner
Infocar - OBD2 ELM Scanner
OBD2 Car Scanner & Diagnostic
Free

Monitor your vehicle's health and performance with this app. It offers real-time diagnostics, driving style analysis, and maintenance tracking. Connect to your car's OBD2 scanner for detailed insights and improved driving habits.

Vehicle diagnostics and fault code clearingReal-time sensor data monitoringCustomizable dashboard with HUD
🔧 Utilities
(499)
free with in-app purchases
17
Engine Link - OBD II diagnosis
Engine Link - OBD II diagnosis
Engine Link - OBD II diagnosis
Vehicle monitoring & diagnosis
$5.99

Transform your iPhone into a powerful vehicle diagnostics tool. Monitor real-time performance, read and clear fault codes, and customize your dashboard with detailed sensor data. Supports emission testing and offers a HUD mode for night driving.

Real-time vehicle monitoringRead and clear OBD fault codesCustomizable gauges and dashboards
🔧 Utilities
(61)
free
18
Toolkit Free – Flash Light, Battery Saver etc.
Toolkit Free – Flash Light, Battery Saver etc.
Toolkit Free – Flash Light, Battery Saver etc.
by MULIAN LI
Free

This app offers a collection of essential tools for everyday convenience. It includes a flashlight, SOS alarm, battery monitor, mirror, ruler, and magnifier to assist with various daily tasks and emergencies.

FlashlightSOS alarmBattery Monitor
🔧 Utilities
(14)
free
19
Torque Pro : OBD2 Car Scanner
Torque Pro : OBD2 Car Scanner
Torque Pro : OBD2 Car Scanner
Torque OBD2 Car Scanner ELM
Free
$12.99 | 100% OFF

Transform your phone into a powerful car diagnostic tool. Read and clear trouble codes, monitor live sensor data, and analyze performance with real-time graphs. Get AI-powered insights and detailed vehicle history reports.

Read and clear trouble codes (DTCs)Live sensor data monitoring and loggingAI-powered trouble code explanations
🔧 Utilities
(393)
subscription
20
GoPoint
GoPoint
GoPoint
by GoPoint Technology, Inc
Free

Monitor your vehicle's performance and diagnose potential issues directly from your iPhone. This app helps you understand fuel efficiency, interpret check engine lights, and assess repair costs, acting like a personal mechanic.

Vehicle efficiency monitoringFuel economy trackingCheck engine light interpretation
🔧 Utilities
(25)
free