Vehicle has 2 codes- p0304-miss fire cyl. 4, also p0133-oxygen sensor circuit. what does bank 1 sensor 1 mean? and also is the misfire on this same bank? How can one cure these problems and what should we be looking for? Thanks
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Here is some detail on the P0304: http://repairpal.com/OBD-Code-P0304
That should get you started. The two codes are likely related to the same root cause.