You can buy a 10 to $15 odb2 reader that will connect to your phone. There's Android application called Torque. It's great. I don't know if the free version can scan error codes but the pro version can and I believe it's about $5. Plus you have a lot more options of things that you can do. It will read your error codes, clear your error codes and also give you nearly any live information about your car that you want.
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Thank you!