Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month
Cheap for ELM with bluetooth
Small/portable (no long or awkward cables)
BT range is long enough. (Laptop, garage, and my n810).
Does the basic OBD functions well
No documentation (including the internal ELM327 of which there are a few DIFFERENT versions or the BT passkey of 0000, or what the leds signify)
The particular ELM327 as implemented can't do ATMA (monitor all) with headers on for very long a not-very-heavily loaded J1850 bus. I don't know what baud rate it uses to connect to the BT, but I have a different ELM that is able to do this without a problem (38400 v.s. 9600 baud jumpered). A more expensive device which does BT OBD which emulates the ELM327 and adds a lot of features is easily able to do this.
Gets multiple responses for a request (which can confuse things especially with the headers off)
Works adequately for basic OBD-II functions (though the multiple responses are annoying)
Very good for basic use considering the compact size and low price.
Look for something more advanced if you need to go much beyond the basics.
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