I've had my Foxwell for years and never had a problem. I don't think you need a $300+ brand specific unit, but I'd recommend something midrange ($50-$100) with good reviews. I think as a whole you get what you pay for but always remember that with two identically priced units where one is wireless and one is not, some of your money is going towards that wireless capability instead of the development of the OBD reader itself. The Bluetooth reader also did not work with the SG generation Subaru Forester I had for 6 months as a winter beater, whereas the NT301 worked flawlessly. The Bluetooth dongle is generally fine for reading and clearing codes, but the wired unit does so much more, updates more quickly, and can live-log an entire drive session. I have two readers - a generic $12 ELM327 Bluetooth dongle that I use with the Torque app, and a $60 Foxwell NT301 which is wired. Bluetooth is just a wireless communications protocol, and has no influence on how well your particular reader will work (unless you're trying to beam a signal outside of a Faraday cage but that's a pretty fringe case). OBD-II uses a high-speed, two-wire bus that connects a variety of subsystems and runs at 500 kbps (actually ranging from 125 kbps to 900 kbps). If you own a car built after 1996, however, it probably has an OBD-II port. I think what you should focus on is the provenance of the reader, not whether or not it is Bluetooth. OBD-I was first introduced in 1987 to standardize the onboard diagnostics across the industry.
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