the crash sensors are built into the chassis at the front of the car. i'm not sure these will be the fault though, have you had the system checked using diagnostic equipment? a diagnostic check will tell you what fault codes are in the system and exactly where the fault lies. be careful if you are planning on looking at the crash sensors, always disconnect the battery first and leave for 15 mins to disarm the system. might be worth check the multi-plugs under the seats, these are common for not making good contact and causing the airbag light to come on.
steve
August 2011