Code 42 - High Resistance Or Open Left Front Impact Sensor Circuit: Description
WARNING: This page is about a different car, the 1995 Ford Pickup, 1995 Ford F-Super Duty, 1995 Ford Cab & Chassis, and 1995 Ford Bronco. However, it is still accessible from the selected car via links, so may be relevant.
Voltage at terminal No. 18 (circuit No. 619), of diagnostic monitor connector, is maintained at 9-11 volts. Circuit No. 619 is connected to circuit No. 625, inside right front impact sensor. If voltage at terminal No. 6 drops below voltage at terminal No. 18, Code 42 is set.