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Originally Posted by sourcemine
No I used both 02 sensors run one after the other, no CEL or anything, just used one modern ODBII cat versus the two old OBDI cats.
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Uh, what is CEL? Using a single cat here too but didn't realize there was an OBD designation for a cat. My O2 sensors are located in the two separate pipes before the Y. The thinking there was that more accurate feedback can be given to the ECU as opposed to two sensors side by side in a single pipe.