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Originally Posted by stateofidleness
consensus seems to be that it is the O2 sensors that are REPORTING the problem, but are NOT the problem. They don't really affect the mixture, they just report it.
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You're most likely going to find out that your impression is incorrect.
If the sensors are faulty, then they will send the wrong signal to the computer, which causes the computer to richen the mixture.
Here, try this:
Switch the O2 sensors from the left exhaust to the right exhaust, and vice-versa.
If the problem follows the O2 sensors, then my suggestion is correct.
If the problem stays with the bank, then you are on the correct path.
It won't cost you anything more than about an hour's time to swap the sensors, and a day to drive the car around.
BC.