I just went to the auto repair shop and they told me I need to replace the oxygen sensor as well as the exhaust/cat manifold. My check engine light is on, so that is what they told me. the problem codes were D0135 (either 5 or s, i cant read his writing), P0700, and P0715 (either 5 or s). Anyone have a clue about how much it wil cost? Or places to buy the parts? any info would be great!