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Durametric
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This appears to be a harness problem, there is no way that all of these sensors have failed at once. This looks very similar to when we are developing a DME without the vehicle and no sensors hooked up. I would look for a portion of the harness that has been severed or disconnected, you might start with a portion of the harness that is easy to reach like the airflow meter and work backwords until you reach the ECU.