Which is the front airbag sensor of a hyundai matrix 1.6 2007 and where is located?

Check the steering sensor it is probably unpluged .and I think that happened in impacting the air bag sens

check fuses and relays their are different locations for air bag sensors and their is also seat belt sensors and seat switches [check the connections under the seat ]---their are sensors under the front bumper behind the valance by the radiator support also if air bag curtains passenger side between inner fender, door and door pillar the following links have information or what to look for and assist in solving your problem the recall doesn't cover your vehicle but it pertained to the passenger air bag problem as well as the 05 posting
Why is my airbag light on 2005 Hyundai Elantra Air Bags Frontal Sensor Control Module Problems More than 280 000 Hyundai Elantras Recalled Over Air Bag Problems

There are several. Plus the module itself. Check the fuses first, Then it is best to have the codes read to find the problem. Messing with airbags can be hazardous.

in the bumper of most cars

it is a recall from kia they will replace something in your steering wheel call the kia motors i had mine done for free because its a recall thats why your light is on a pin went nad they need to replace it call them

Normally the light comes on when airbag fuse is blown. But it could be a bad airbag sensor located at the front of the vehicle. Check fuse first, if that's not it, I would recommend taking it to a mechanic to have sensor changed. They are very delicate sensor and could deploy airbag if not done carefully.

Air bag sensors are located all around the car. They're bright orange in color and easily seen if you open hood and look on upper fender wells

Probably a wheel sensor. But have the vehicle scanned for codes and do the repair the codes describe.

Pinpoint Test R: Diagnostic Trouble Code 44 — RH Radiator Primary Crash Front Air Bag Sensor Not Mounted to Vehicle Properly Normal Operation
NOTE: Circuit 618 (BL/W) is grounded to the side of the RH radiator primary crash front air bag sensor case, and the case is grounded through the bracket to the vehicle at its mounting point.
The air bag diagnostic monitor (14B056) measures the resistance between pin 20 (circuit 618 [BL/W]) and pin 3 (circuit 57M [BK]), the air bag diagnostic monitor reference ground. If the air bag diagnostic monitor measures a difference of more than 2.0 ohms between pin 20 and pin 3, it will flash diagnostic trouble code (DTC) 44.
Possible Causes
High resistance on pin 20 (circuit 618 [BL/W]) to ground can be caused by:

• A poor connection due to loose mounting, dirt, or corrosion at the RH radiator primary crash front air bag sensor bracket mounting location.
• An open or damaged wire in circuit 618 (BL/W) from pin 20 of the air bag diagnostic monitor connector to the RH radiator primary crash front air bag sensor connector.
• An open circuit inside the RH radiator primary crash front air bag sensor.

i have a hyundai matrix 2002 too and this morning as I drove in a light came on on the dash with a picture of an engine and the word 'check. What could be the problem?