Best Bluetooth Bi-Directional Scanners in 2025

I believe the J2534 adapters are the future of car diagnostic tools for home mechanics as they can give you professional OBD-II functionality for a cheap entry price. I bought and compared 5 of them, ranking them from best to worst in the following table.

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xTool A30
  • Bi-Directional
  • iOS/Android
  • Data logging
  • No subscription
Topdon Topscan Lite
  • Semi-professional tool
  • Full car health report PDF
  • Bi-Directional
Thinkdiag2
  • Professional tool
  • Great brand coverage
  • Service & Coding
Kingbolen Ediag
  • Access to all modules
  • Bi-directional
  • Service procedures
  • No subscription
KDiag
  • Bi-directional
  • No subscription
  • Service procedures
  • All-system scan

Who tested product & wrote this review?

Juraj Lukacko

Tester & Editor for this review: Juraj Lukacko

Hello, I am Juraj (Yuri) and I tested this product to help you decide if it is something you would want to buy, and if yes, show you how to use it.

I make honest reviews based on personal testing in my own garage and If I see the product is bad, I will make it very clear in review.

Read more about how I do reviews on Iamcarhacker.com in my review policy.

xTool A30 is an ultimate budget pick

a30 anyscan OBD

xTool A30 is a Bi-directional scanner with decent vehicle coverage for its price. The best part of this scanner for us DIY mechanics is that updates are free for a lifetime.

So you only pay once and you get to enjoy this tool for as long as it works without having to pay a yearly license.

It does everything you need to diagnose car problems and even used car checks.

Let’s stick to exploring cheaper options first and then we will work our way to more expensive scanners.

Konwei KDiag

konwei KDIAG

Konwei Kdiag is a scanner I discovered just a few months ago when someone pointed it out in YouTube comments on my channel as a great budget pick.

It can scan all modules, do bi-directional testing, and even perform some service procedures like oil reset, brake pad reset, etc… a total of 4 procedures.

It does not have a large brand coverage so I suggest you download the app KDiag first and check if the brands are a good fit for your needs.

Adapters comparison

Let’s compare these scanners’ features to help you make decisions based on key parameters.

xTool A30Thinkdiag2DriverscanTopscan Lite
Full scanYesYesYesYes
Full live data + graphsYesYesYesYes
Data loggingYesYesYesYes (+ photos)
Diagnostic reportYesYesYesYes
Bi-DirectionalYesYesYesYes
Service procedures8 (cheapest version)15158
ECU codingYes
Subscription price (year)FREE $95$50$50
Adapter pricehttps://amzn.to/4eIO3IEhttps://amzn.to/4eIO3IEhttps://amzn.to/4eIO3IEhttps://amzn.to/4eIO3IE

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