E3 - O2 sensor adaptation limit, Cyl#1-3
E4 - O2 sensor adaptation limit, Cyl#4-6

Don't know if this is referring to pre-cat sensors or post-cat sensor. Live data will tell if the sensors are working or dead. Voltage for precat sensor should fluctuate as the mixture is adjusted by the 02 sensor. If the voltage doesn't fluctuate that means the sensor is dead.

Post cat sensors should show almost a constant voltage, If there is no voltage the sensor is dead. Actual short term and long term fuel trim data will show you if you have a rich or lean condition. Without live data it is just a crap shoot as to what is wrong. You might as well throw parts at it with the parts cannon.

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