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I owned 96 Impreza.It misfire on my way home.I do not know what's wrong,for I just change the battery and alternator,so I read the fault code with my Ms509 OBD2 code reader and it shown P0328, P0340, P0420, P0031.What's the code?Is it easy if I repair myself?

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Did these all come up at the same time? If so then you almost certainly have an electrical problem. It is possible that they are all due to the knock sensor, however.

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