The most pervasive issue with ELM327 Bluetooth devices is that some low-cost scanners include unauthorized ELM327 microcontroller clones. These cloned chips often exhibit strange behaviors, but even legitimate hardware fails to work with certain devices. If you want to use an iOS device as a scan tool, it’s especially important to pay attention to these issues.
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Scan tools that include an ELM327 microcontroller and a Bluetooth chip are capable of pairing with a variety of devices, but there are some important limitations. The primary devices you can use an ELM327 Bluetooth scan tool with are: