What is Mini OBDII and how does it work?

Mini OBDII is a free car diagnostic app that connects to your vehicle's OBD-II port through a Bluetooth or WiFi ELM327 adapter. Once connected, it reads data from your car's ECU to display fault codes, real-time sensor data, and performance metrics on your phone.

Which vehicles are compatible with Mini OBDII?

Mini OBDII works with most vehicles manufactured after 1996 (US), 2000 (EU), or 2002 (Asia). Any vehicle with a standard OBD-II port and one of the 9 supported protocols is compatible.

What OBD-II adapter do I need?

Mini OBDII works with ELM327-based Bluetooth 4.0 (BLE) or WiFi OBD-II adapters. We recommend adapters based on the ELM327 V1.5 or V2.0 chipset for best compatibility.

Is Mini OBDII completely free?

Yes, Mini OBDII is 100% free to download and use on both iOS and Android. There are no in-app purchases or hidden fees for the core diagnostic features.

Does the OBD adapter drain my car battery?

OBD-II adapters draw very minimal power from your vehicle's battery. However, it's recommended to unplug the adapter when not in use for extended periods, especially if your vehicle will be parked for days.

Can someone remotely control my car through the OBD port?

No. The Bluetooth and WiFi signals from OBD adapters have a very limited range (typically under 10 meters). Mini OBDII only reads data and can clear fault codes — it cannot control any vehicle systems.

Why does the speed shown differ from my dashboard?

Your car's speedometer may have a slight margin of error (usually reads 2-5% higher for safety). The OBD-II data from Mini OBDII reflects the actual speed calculated by the ECU, which is typically more accurate.

How do I connect the adapter to my phone?

1) Plug the ELM327 adapter into your vehicle's OBD-II port (usually under the dashboard). 2) Turn on your vehicle's ignition. 3) Open Mini OBDII and go to Settings to connect via Bluetooth or WiFi. The app will auto-detect and connect to the adapter.

Free Car Diagnostic App

About Mini OBDII

The free OBD-II car diagnostic scanner app trusted by 100,000+ drivers worldwide.

Mini OBDII connects to your vehicle's OBD-II port via a Bluetooth or WiFi ELM327 adapter, giving you instant access to engine fault codes, real-time sensor data, and performance metrics — all from your phone.

App Store Google Play

Trusted by Drivers Worldwide

0K+

Downloads

OBD Protocols

Languages

Vehicle Years

What is Mini OBDII

Your Free Professional Car Diagnostic Companion

Mini OBDII is a free mobile application that turns your smartphone into a powerful car diagnostic tool. By connecting to your vehicle's OBD-II port through a Bluetooth 4.0 or WiFi ELM327 adapter, you can instantly read and clear engine fault codes, monitor real-time vehicle data, and track your driving performance.

Read & Clear DTC

Instantly read and clear diagnostic trouble codes from your vehicle's ECU.

Real-time Dashboard

Monitor RPM, speed, coolant temperature, and more in real time.

Performance Testing

Measure your vehicle's acceleration and performance metrics.

Trip Analysis

Track fuel consumption, distance, and driving costs per trip.

Whether you're a car enthusiast who loves to understand your vehicle, a DIY mechanic looking to diagnose problems before visiting a shop, or simply a driver who wants to know why the check engine light is on — Mini OBDII gives you the answers you need, for free.

Core Features

Everything You Need to Diagnose Your Car

Mini OBDII provides professional-grade OBD-II diagnostic features — completely free.

Fault Code Reading & Clearing

Read diagnostic trouble codes (DTCs) from your vehicle's ECU and clear them to turn off the check engine light — in under 60 seconds.

Real-time Instrument Dashboard

A virtual dashboard displays live vehicle data including RPM, speed, coolant temperature, intake air temperature, and fuel consumption.

Performance Testing

Measure your vehicle's 0-60 mph acceleration time and other performance metrics with precision.

Trip & Fuel Analysis

Automatically record trips and analyze distance traveled, fuel consumption, average speed, and estimated fuel costs.

9 OBD-II Protocol Support

Supports all standard OBD-II protocols including SAE J1850 PWM/VPW, ISO 9141-2, ISO 14230-4, and ISO 15765-4 CAN variants.

Ultra-Low Power Design

Optimized for minimal battery drain — approximately 5% phone battery consumption for 15 minutes of continuous diagnostics.

About the Developer

Powered by 16+ Years of OBD Expertise

Mini OBDII is developed by Shenzhen Chaoyue Technology Development Co., Ltd., a National High-tech Enterprise established in 2009. With over 16 years specializing in automotive OBD diagnostic technology, Chaoyue Technology has built a reputation for reliable, high-quality diagnostic solutions.

About the Developer

Expert Engineering Team

Certifications & Quality

ISO 9001 Quality Management
ISO 14001 Environmental Management
IATF 16949 Automotive Quality

Expert Engineering Team

Our team of 30+ R&D engineers, each with 8+ years of experience, is dedicated to delivering the best car diagnostic experience on mobile.

Your Privacy Matters

Mini OBDII does not share your data with third parties. All diagnostic data is stored locally on your device and encrypted with SSL. You have full control over your data.

Frequently Asked Questions

Answers to common questions about Mini OBDII

Start Diagnosing Your Car for Free

Download Mini OBDII and turn your phone into a powerful car diagnostic tool. No registration required.

App Store Google Play

Works with any ELM327 Bluetooth or WiFi adapter.