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Originally Posted by JAAY
BYPASS Pipes = you just bypassed your secondary catalytics and now your 02 sensors know it and are throwing the code. You can buy 02 extenders or have the ecu reflashed with a ROW flash.
I hope this helps.
Jay
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Ummm no. The pre-cat O2s are in the headers, as are the post-cat O2s. The secondary cats have no O2s behind them.
There is absolutely no reason you should throw a CEL from removing the secondary cars.