Buying guide · Basics · 9 min read
What an ELM327 is, its versions and which to buy
The small adapter that turns your phone into a fault-code reader. What is behind the name, why almost all of them are clones and which one suits you.

Bluetooth adapter · Mini size
Mini-size ELM327 Bluetooth, version v2.1: reads and clears engine fault codes and shows basic live data on an Android phone or a PC.
€8.60 VAT included · Satkit price checked on 7 October 2026
Prices incl. VAT checked on 7 October 2026; they may change.
An ELM327 Bluetooth in a mini housing. It reads and clears fault codes and shows data such as coolant temperature, intake pressure or ignition timing.
It reports itself as v2.1, but it has the same chip as the ELM327 Bluetooth v1.5 (explained below).
v2.1 with a PIC18F25K80 chip?
This adapter uses the same PIC18F25K80 microcontroller as Satkit's ELM327 v1.5 adapters. "v2.1" is just the number the firmware reports when an app asks for it (the ATI command), not the chip: a clone can report any version it likes. Inside, it is the same chip as the v1.5. To see which commands it really answers, test it with an app such as ELM327 Identifier (Android).
iPhone users
It is classic Bluetooth: it will not work with an iPhone or iPad. For iPhone, get a Wi-Fi adapter instead.
Related guide
Buying guide · Basics · 9 min read
The small adapter that turns your phone into a fault-code reader. What is behind the name, why almost all of them are clones and which one suits you.
Practical guide · Apps · 12 min read
The adapter does nothing on its own: what you see on screen depends on the app. Which ones exist for each system, what they cost, which adapter they work with and how to do the most common jobs step by step.
Comparison · Bluetooth
All three Bluetooth ELM327 adapters use the PIC18F25K80 chip. The real differences in size, price and compatibility, and which one suits your car.

Bluetooth adapter · To get started
Bluetooth OBD2 adapter to read and clear fault codes and see live engine data on an Android phone or a PC.

Bluetooth adapter · Basic
The simplest ELM327 Bluetooth v2.1, with status lights: reads and clears engine fault codes on Android or Windows, but does not work with every car.

Bluetooth adapter · Konnwei brand
Konnwei Bluetooth OBD2 adapter for Android and Windows, with all five OBD2 protocols and automatic power-off when idle.