Report "I have several codes in my Nissan Titan after installing aftermarket headers and catalytic converters. I have the following codes: P1148, P1168, P0130, P0150, P0153, P1564 and P1574. I also installed aftermarket gears in the rear diff. I've been told that P1564 and P1574 are due to the bigger gears installed in the diff. I also know that the first 5 codes listed are from both O2 sensors. My questions are, are these the sensors closest to the engine or farthest from the engine? If I replace both sensors, all but 2 codes should go away correct? Thank you"