The Office of Defects Investigations (ODI) is an office within the NHTSA which investigates serious safety problems in the design, construction or performance of vehicles. The NHTSA is authorized to order manufacturers to recall and repair vehicles, if the ODI finds a safety issue. NHTSA investigations for the 1991 Ford Explorer, both ongoing and closed, are listed below:

1. INVESTIGATION: ENGINE COOLING FAN CRACKS

   NHTSA #PE94044

   Status:

   CLOSED

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2. INVESTIGATION: PARKING PAWL

   NHTSA #RQ97015

   Status:

   RECALLED

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4. INVESTIGATION: PARK PAWL BENDING

   NHTSA #PE91127

   Status:

   RECALLED

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5. INVESTIGATION: FRONT SEAT TRACK FAILURE

   NHTSA #PE92084

   Status:

   CLOSED

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6. INVESTIGATION: SEPARATION OF MASTER CYLINDER

   NHTSA #EA95018

   Status:

   RECALLED

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7. INVESTIGATION: BRAKE MASTER CYLINDER/BOOSTER SEPARATION

   NHTSA #PE95001

   Status:

   CLOSED

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8. INVESTIGATION: VACUUM BOOSTR VALVE FAILS

   NHTSA #EA91040

   Status:

   CLOSED

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9. INVESTIGATION: VACUUM BOOSTR VALVE FAILS

   NHTSA #PE91084

   Status:

   CLOSED

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10. INVESTIGATION: SPARE TIRE WINCH CABLE

    NHTSA #EA00012

    Status:

    CLOSED

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11. INVESTIGATION: SPARE TIRE WINCH CABLE

    NHTSA #PE99072

    Status:

    CLOSED

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12. INVESTIGATION: LIFTGATE SUPPORT BRACKET FAILURE

    NHTSA #RQ99016

    Status:

    PENDING

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13. INVESTIGATION: HEAVY LATERAL VIBRATION

    NHTSA #DP98001

    Status:

    CLOSED

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14. INVESTIGATION: SUNROOF SHATTERING AND SEPARATION

    NHTSA #EA97011

    Status:

    RECALLED

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15. INVESTIGATION: WHL SEPARATION/TORQUE LOSS

    NHTSA #PE92029

    Status:

    CLOSED

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16. INVESTIGATION: THROTTLE STICKING

    NHTSA #EA93003

    Status:

    CLOSED

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17. INVESTIGATION: THROTTLE RELEASE FAILURE

    NHTSA #EA91034

    Status:

    CLOSED

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18. INVESTIGATION: THROTTLE RELEASE FAILURE

    NHTSA #PE91058

    Status:

    CLOSED

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