The SIR sensor replacement policy requires the replacement of sensors where there is accident damage, which is any part of the vehicle that has been crushed, bent, or damaged from a collision such as when the front of the vehicle hits a tree. It is necessary to replace the sensor even if the air bags were not used, and even if the sensor seems to have no damage on it because hidden damage such as slightly bent mounting bracket or cuts in the insulation of the wire can result in wrong operation of the SIR sensing system. Therefore do not make any efforts to evaluate the sensor for visible damage; simply replace it. Also, in case a malfunctioning sensor is shown by a Diagnostic Trouble Code (DTC) table, the sensor needs to be replaced as well.