# FourStroke OBD2 Car Scanner — OBD Bluetooth & Wifi Toolkit

> Real-time vehicle sensor data and diagnostics via OBD2 adapter. (iPhone/iPad app by Mike Morawski.)

- Source: https://appshunter.io/ios/app/fourstroke-obd2-car-scanner/id946722526 (this page in markdown: same URL + `.md`)
- Developer: [Mike Morawski](https://appshunter.io/developer/945271398)
- Category: Utilities, Travel
- Price: Free with in-app purchases
- Rating: 4.66/5 from 922 App Store ratings · 90 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.0 · 17 MB
- Languages: English, Russian
- Released: 2015-02-03
- Data updated: 2026-06-10
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/fourstroke-obd2-car-scanner/id946722526/reviews.md

## What is FourStroke OBD2 Car Scanner?

FourStroke is a powerful tool that analyzes and displays real-time vehicle sensors and data through your vehicle's OBD2 port, a port standard on most vehicles across the world. Use of this app requires a third-party OBD2 Wifi or Bluetooth BLE Adapter. Our app is FREE to pull and clear engine codes along with most other functionality! 

FourStroke can convert your device into a heads-up display of just about every sensor your car supports, without needing expensive gauges. Sensors include RPM, coolant temperature, vehicle speed, air flow, O2 sensor data, and more (sensor support varies based on vehicle).

Quickly diagnose a check engine light (CEL) by pulling up exactly what error codes are present. FourStroke automatically turns the code into a readable description. Your vehicle also may store 'Freeze Frames' that detail what sensor data was present when the CEL first occurred; FourStroke can display this information for you.

In-app purchases are available for reading more advanced sensors as well as a performance upgrade for fully unlocking our dynamometer (horsepower & torque reader) and a 1/4 mile analyzer.

DISCLAIMER: This app requires a third-party OBD2 adapter. This app does not support ABS codes or proprietary commands.

## Key features

- Real-time vehicle sensor display
- Check engine light diagnosis
- Error code reading and description
- Freeze frame data display
- Heads-up display for sensors (RPM, speed, temp, etc.)
- Dynamometer and 1/4 mile analyzer (in-app purchase)

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Sensor Upgrade Package | $3.99 | one-time |
| Performance Upgrade | $2.99 | one-time |


## What do users think of FourStroke OBD2 Car Scanner?

Overall sentiment: positive

**Pros**

- 🚀 Easy to use
- 👍 Useful tool
- 🚀 Works great
- 🚀 Fantastic
- 🚀 Handy and useful
- 👍 Customizable interface
- 🚀 Simple and easy to operate
- 👍 Intuitive and user-friendly
- 🚀 Connects easily
- 🚀 Performs well
- 👍 Visually appealing
- 🚀 Reliable
- 👍 Straightforward

**Cons**

- 🐛 Doesn't read transmission faults
- 🐛 Won't recognize certain Bluetooth adapters
- 🔒 Limited features in free version

**Commonly reported bugs**

- Trouble connecting to some vehicles
- Occasional crashes or freezes

**Most requested features**

- Add support for oil pressure
- Add support for more vehicle types
- Add Apple CarPlay support
- Add Bluetooth connectivity
- Add ability to rotate dashboard
- Add air/fuel ratio gauge
- Add SRS airbag reset function
- Add 0-100km/h time tracking

## Recent user reviews (10 of 90)

All indexed reviews: https://appshunter.io/ios/app/fourstroke-obd2-car-scanner/id946722526/reviews.md

### 5/5 — Easy to use

*2024-12-12*

If you have a OBD  reader this works amazing. Looking for a free way of reading and this works perfect. It’s worth the time to down load. Other will let you read but not clear codes. With this you can do both. It works great. Enjoy it like me and down m load now.

### 5/5 — Lovely App Looks Great to

*2024-11-21*

This app so far looks and feels great , even with the limited lite app, it’s still possible to make and use the well laid out dashboard 👍🏻

### 5/5 — check engine

*2024-11-14*

Clear codes

### 5/5 — Great little tool

*2024-10-29*

Works a treat, I can connect it to a low cost WiFi OBD2 adapter to read and clear fault codes which massively helps with basic trouble shooting. Very happy with this app.

### 3/5 — Doesn’t read transmission faults

*2024-10-29*

I’ve been chasing my tail to rectify a power and acceleration issue. 
I went into my local workshop which connected up and read P1705 - Throttle position sensor.
On this app that code doesn’t exist!

### 5/5 — Fantastic

*2024-10-06*

FourStroke is a great simple to operate system that clears and codes that come up!

### 5/5 — Great app for shade tree mechanics

*2024-09-29*

Been using this app for years. Simple and to the point. Can’t clear everything but good enough for the basics. 2 Thumbs up!!!

### 5/5 — Handy and useful

*2024-08-08*

Also, very easy to use. Connect to my adapter gives me exactly what I need and tell me what’s going on.

### 5/5 — Useful

*2024-08-01*

A clear and customizable interface, and ability to clear codes and check to see if my SMOG is likely to pass or not.  Very useful!

### 5/5 — Four stroke

*2024-07-31*

It’s a great app!! I use it all of the time over any other scanner

## Frequently asked questions about FourStroke OBD2 Car Scanner

### What does the FourStroke OBD2 Car Scanner app do?

This app analyzes and displays real-time data from your vehicle's OBD2 port. It can help you diagnose check engine lights by reading error codes and their descriptions, and display various sensor data like RPM, speed, and temperature. It requires a third-party OBD2 adapter to function.

### What are the key features of this app?

Key features include displaying real-time vehicle sensors, diagnosing check engine lights, pulling and clearing engine codes with readable descriptions, and showing freeze frame data. Advanced features like a dynamometer and 1/4 mile analyzer are available via in-app purchases.

### How much does the FourStroke OBD2 Car Scanner app cost?

The app is free to download and use for pulling and clearing engine codes and most other basic functionalities. Advanced sensor readings and performance upgrades, such as the dynamometer and 1/4 mile analyzer, are available through in-app purchases.

### What devices is this app compatible with?

The app is designed to work on mobile devices. However, it requires a third-party OBD2 Wifi or Bluetooth BLE Adapter to connect to your vehicle's OBD2 port. The app does not support ABS codes or proprietary commands.

### What are common use cases for this app?

Common use cases include quickly diagnosing a 'check engine' light by understanding the specific error codes, monitoring real-time engine performance metrics like RPM and speed without needing expensive gauges, and analyzing vehicle performance during acceleration with the optional dynamometer and 1/4 mile analyzer.

## Version history (last 5 releases)

### 8.1.0 — 2023-10-04

- Improvements: Information sections revised

### 8.0.1 — 2023-09-20

- Bug fix: Fixed issue preventing ability to select certain settings

### 8.0.0 — 2023-09-05

- Addition: Added ability to customize gauge colors

### 7.4.0 — 2023-08-22

- Improvements: Stability enhancements and minor bug fixes surrounding charting

### 7.3.0 — 2022-02-24

- Addition: LELink OBDII BLE adapter compatibility

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## More apps by Mike Morawski

- [Crystal Lotus: Mindful Guide](https://appshunter.io/ios/app/crystal-lotus-mindful-guide/id1601317725)

All apps by Mike Morawski: https://appshunter.io/developer/945271398

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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 2026-06-10.*