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Thats what everyone told me too but I've never had to do it.
I just connected up my meter to the X11 and read out the duty cycle.
Let me know what you come back with.
If you've got a bad Oxygen sensor it will read out a solid 50% after you let the engine sit for abit.
IIRC, the engine start out in pure mechanical mode, which will read out 50%, then it will go to computer control, closed loop, and start adjusting which is where the duty cycle should start to change. If it stays constant at X% then you've got a faulty component somewhere.
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