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Mechanic muffler shop replaced defec. cat that caused engine light to come on. Don't know which bank # he replaced. Seems rear most, easier to get to he said. Now after 500 miles light came on again, and check says def. bank 1 converter. Is this the same one or the other one possibly?
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Cylinder 1 is at the front crank pulley side of the engine. Bank 1 is the front exh manifold, sensor two for bank one is behind the cat. convt. Bank 2 is reward exh. manifold, B2S2 is behind the cat. covt.