What NHTSA says the defect is
ON CERTAIN PASSENGER VEHICLES WITH MANUAL TRANSMISSIONS, THE HEAT INSULATOR MAY BE CRACKED CAUSING ABNORMAL NOISE.
The risk NHTSA states
CONTINUED OPERATION OF THE VEHICLE CAN CAUSE THE INSULATOR TO COME OFF AND COULD POSE A HAZARD TO FOLLOWING VEHICLES.
The remedy NHTSA states
DEALERS WILL REPLACE THE HEAT INSULATOR. THE RECALL BEGAN MARCH 5, 2004. OWNERS SHOULD CONTACT MAZDA AT 1-800-222-5500.
Campaign 04V075000 · reported to NHTSA 17 February 2004 · Read it on nhtsa.gov →