governor said: I bought this pos and it didn't work on my car. Many car manufacturers use proprietary codes that regular scanners can't use. Still. this should read at least some codes on all cars sold in the US since 1996.
Bought one of the Bluetooth ones for ~$6 and works fine. My dads old BMW has some issue with the transmission occasionally slipping (IIRC) that results in an error code. Only fix is to replace the whole transmission apparently, and it's not worth it for an error that only pops up 3-4 times a year in a 15 year old car. After getting the dongle connected and setup we cleared the error in just a minute or two. Same thing the local garage charged him $30 for (and the dealer probably a couple hundred).
On another note, using one of the Bluetooth models with a smartphone is a lot easier to deal with IMO, if only based on the 2 line LCD and 2 button interface on this model. With a smartphone's touchscreen, an app like Torque means you can do more quickly and easier than this model.
That being said, despite the large # of dongles that work just fine, I've seen a good number of complaints from people that have had problems with theirs. They're all generic copies of the original ODBII / bluetooth interface chip, the ELM327, and made as cheaply as possible in order to sell them for $5 a pop, so manufacturing defects aren't uncommon. Though to some extent that can be true of most any mass produced inexpensive electronics these days.
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