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I found out that after putting the device, the 2nd O2 sensor is unable to get any exhaust reading, hence throwing another CEL with different code.
I've just shorten the add-on and hope this time the 2nd O2 sensor will pick up some reading, not too much exhaust gas and not too little, just nice will do.
Then I'll fool the 2nd O2 sensor that I have CAT installed. Still on the trial.
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