It would be impossible for all 4 sensors to fail & send a code at the same time unless it was a common problem like water or something. It sure explains the symptoms though. The 02 sensors are detecting oxygen in the exhaust & sending the signal to the PCM that is then adjusting air/fuel mixture. This is happening very quickly and continuously except in warm up mode (about 30 - 60 seconds after startup) & at wide open throttle. If this ever happens again, try absolute wide open throttle. The PCM then ignores the oxygen sensors and takes over control of the mixture (open loop).
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Jonahs
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