There are cheaper littler ones available, but I've had terrible success with them. I think one out of maybe 5 I bought worked.

This one has worked well for me, however. I like to carry one in each car so I can troubleshoot on the road.

https://smile.amazon.com/BAFX-Produc...obd2+bluetooth

AM.

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E53 2004 3.0 M54 AT Toledo Blue with Gray Leather
E83 2008 3.0 N52 AT Silver Gray Metallic with Black Vinyl
E46 1999 2.8 M52TU 5MT Black with Tan Leather 250K+ miles (Sold, but not forgotten)