How to Choose the Best OBD2 Adapter (ELM327 Guide)
Bluetooth or Wi-Fi, do cheap ELM327 clones work, what to look for — a guide to choosing the right OBD2 adapter.
Updated: November 13, 2026
AutoMulti doesn't sell hardware; it works with OBD2 adapters already on the market. So which one should you buy? For most users, an ELM327-based Bluetooth or Wi-Fi adapter is enough.
Bluetooth or Wi-Fi?
On Android, both Bluetooth and Wi-Fi adapters work well. On iPhone, classic cheap Bluetooth (SPP) adapters can be problematic, so Wi-Fi or BLE (Bluetooth 4.0+) adapters are safer.
Do cheap clones work?
Yes, most cheap ELM327 clones work for standard OBD2 reads. AutoMulti focuses on speed and stability even on these adapters. But some very cheap clones can cause dropouts; if possible, choose a known chip (a genuine ELM327 v1.5 or a good BLE adapter).
What to look for
- Compatibility with your phone (Wi-Fi/BLE for iOS)
- Stable connection and good reviews
- Support for your car's protocol (CAN is the common standard)
- Dropout risk with ultra-cheap, unbranded units
Once your adapter is plugged in, open AutoMulti; the app finds it automatically and connects in seconds.
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