Quote:
Originally Posted by Bswanny
Anyone know why the 2014 and up Zs O2 sensors are more sensitive? Did the sensors themselves change?
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The newer ECUs have a different control strategy to check for a lean/rich bias of the air/fuel sensor, using the post cat O2 sensor.
With a test pipe and the "anti-foulers", the rear O2 sensors don't switch as they should, since they are 2-3" out of the exhaust stream. Generally they only see the O2 that is "captured" in the anti-foulers. The ECU interperpates this as a lean condition.