This one can be very simple if you have an OBDII reader. You can pick one up for cheap... maybe a 150-250 for a simple DIY'er. I would not worry about spending all my money on the latest reader with all the definitions (those codes are on the internet). Save your money for the repair.
Have a reader is not a bad idea... you are promised to need it more than once. Beside you can help your neighbor out at times.
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