Help Please. I have a 2001 307 hdi 110. I have no boost when the outside temperature is below 12 degrees, boost returns when engine temp warms up. If the outside temp is above 12 degrees the car performs perfectly. Have changed the mass airflow sensor as this showed as a fault but problem unsolved. Does the boost sensor detect temp? are there any temp sensitive sensors that affect the operation of the wastegate. Any help would be really appreciated as dont want to keep throwing money at it chasing a problem.