B1942 is the left front counterpart to B1941. The airbag diagnostic monitor could not verify the loop through the driver side front impact sensor, so it stored the code and lit the warning lamp.
The monitor sets the feed circuit slightly below battery voltage and pulls it down on a schedule to confirm the sensor is still connected on the other end. If that check fails on the left front sensor, B1942 goes into memory. Autocodes lists the Ford definition as left front impact sensor feed and return circuit open, which is the same test strategy used on the right side with a different sensor at the end of it.
The driver side of an engine bay is a rougher environment than the passenger side on most vehicles. Battery acid vapor, coolant from an overflow bottle and washer fluid all end up on that corner, and the sensor connector sits low enough to catch it. Corrosion inside a connector shell can pass a visual inspection and still fail the monitor's test.
Circuit fault. B1942 tracks a live connection, not a stored accident. If the vehicle also went through a deployment, the crash record sits in its own codes and gets handled separately from this sensor circuit.
No, and clearing it before the repair only hides the problem for one key cycle. Restore the circuit, then confirm the code stays gone. If the sensor is bad, a genuine OEM replacement is the right part; you can start a search in our impact sensor listings. Where the same vehicle is also holding locked crash data, that is what our crash data reset is for.
Ford, Lincoln and Mercury vehicles from the years that used separate front impact sensors reporting to an airbag diagnostic monitor. As with B1941, other manufacturers use this number for unrelated restraint circuits, so a B1942 pulled off a different brand needs its own service information.
Unplug the left front sensor connector and look at the pins under good light. Green or white powder means the connector is the repair, and a new pigtail is worth more than another round of contact cleaner. Also check for a related mounting code, since Ford logs a separate fault when a front sensor is not solidly bolted to the body. If you find B1942 and B1941 together, look for a common harness or a shared ground rather than two failed sensors.
Related codes: B1941 (right front crash sensor open), B1193 (crash event storage locked), and B1318 (battery voltage low).
Related codes: B1941, B1193, B1318
Keep reading:
Code scope: Ford, Lincoln, Mercury. The same number can mean something different on another manufacturer, so match the code to your make before you act on it.
A reset clears stored crash data. A replacement part fixes a hardware fault. We have read these codes since the nineties and will tell you which one you are looking at.
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