Are Cheap OBD2 Scanners Any Good? A Mechanic's Honest Breakdown
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Time to read 3 min
Introduction
With prices starting as low as $30, its temping to throw a cheap OBD2 Scanner into your glovebox. But will it really save the day when the check engine light comes on?
Cheap OBD2 scanners are extremely popular due to their affordability and user-friendliness. They are a handheld diagnostic computer that is capable of reading and erasing codes on a limited number of systems. The functionality and coverage depends on the brand.
Table of Content
The Cheap Lifesaver
Some time ago, while on my way home from work, the check engine light lit up in my old Hilux. The throttle felt lazy, like it was running on half power.
I pulled over, grabbed my cheap scanner from the glovebox, and plugged it in. It threw a P0101 —MAF sensor performance issue. A quick search pointed to a dirty Mass Airflow sensor.
I had some MAF cleaner in the tray, so I gave it a quick clean, reinstalled it, and cleared the code. The light stayed off, and the ute instantly felt smoother.
Not bad for a 10-minute fix and a cheap scanner that’s already paid for itself.
A basic OBD2 scanner can get you a long way - even on a limited budget.
Regardless of your skill level, they can be a great tool for routine maintenance checks and basic diagnostics.
But perhaps the best part of these basic OBD scanners is that they fit perfectly into the glovebox!
Where Cheap OBD2 Scanners Shine
Great for:
Reading and clearing generic codes (like P0101 - MAF Sensor Performance).
Resetting warning lights temporarily.
Perfect for used car buyers to check vehicles on the spot.
Giving beginners a foothold in DIY diagnostics.
Limitations of Cheap Scanners:
Limited access to manufacturer-specific (OEM) codes.
No bi-directional controls or active component testing.
Generic code descriptions (e.g., P0300 – multiple cylinder misfire) without root cause clarity.
Limited Coverage: May not support all vehicle makes/models.
TIP: For simple issues, a basic OBD2 scanner will get the job done!
Must Have Products For Beginners
When it is Time to Upgrade
For experienced enthusiasts, fleet managers and mechanics, a cheap OBD2 scanner simply won't have the required functionality.
This is where mid-range and professional scan tools can offer a better diagnostic experience.
These scan tools boast features that are worth paying for, including:
- Bi-Directional Control: For active/component testing.
- Data Analysis: Live data with advanced data graphing.
- OEM-Specific Diagnostics: Including OEM Diagnostic Trouble Codes.
- ECU Programming: Module Coding.
High-end scan tools are a worthy investment, and often save money in the long run, but they are best suited to advanced enthusiasts and professionals.
Tip: “Don’t just buy based on price—look at what features you’ll actually use.”
Mid-Range Scan Tools
Final Thoughts: Which One is Right for You?
If you’re a casual car owner who just wants quick answers when a warning light pops up, a cheap scanner is more than enough for basic peace of mind.
For those who service multiple vehicles or enjoy tackling DIY repairs, investing in a mid-range or premium scanner gives you better data, wider compatibility, and more confidence under the bonnet.
If you're a professional or serious enthusiast, a high-end scanner is absolutely worth the investment—offering advanced diagnostics, bi-directional controls, and the ability to handle complex issues across a range of vehicles.
In short, the right scanner depends on how deep you want to go—but even the cheapest ones can be incredibly useful when paired with a bit of know-how.
Cheap OBD2 Scanners are great for DIYers and beginners.
Mid-Range Scanners are the perfect balance between affordability and functionality for enthusiasts and small workshops.
Premium-Quality Scanners are worthy investments for professional workshops and expert technicians.
If you're looking to buy a scan tool, click here to explore our comprehensive range of products. For additional enquiries or to speak to an expert, you can contact us here.
Products Featured In This Blog
Frequently Asked Questions
Are cheap OBD2 scanners accurate?
For basic codes, yes. But they lack the depth to pinpoint complex issues or manufacturer-specific fault codes.
Can a cheap scanner damage my vehicle?
Not likely. Most just read data—no commands are sent. However, avoid overly generic or knockoff brands.
What's the difference between generic and OEM codes?
Generic codes (like P0171) apply to all vehicles. OEM codes are manufacturer-specific and require better tools to read.
Are smartphone OBD apps reliable?
Some are great when paired with a good Bluetooth dongle (like the Topdon TopScan PRO), but others are still limited compared to a pro-level scanner.
