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The H.T. Firmware upgrade to the standard ECU, will generate a EGR error code, P0401 "insufficient flow detected", as the thermistor embedded in the EGR body will not indicate any heat (>136.4 * F.) as it is not getting any heat from the exhaust manifold. However since the EGR rediness test runs very infrequently it will take a while to show up.
 
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