What does code b1342 mean for the ford f150?

The B1342 code on a Ford F-150 means that the Electronic Control Unit (ECU) has failed, usually, the code is combined with other issues or codes. Your ECU is a computer system that operates by way of a network of sensors. These sensors monitor fuel economy as well as emissions, fuel injection, and many other aspects of how Your engine functions. One of the functions of Your engine control unit is spark timing. The way Your engine sparks and fires the fuel/oxygen mixture is are usually the most precisely timed system in Your entire car. If this becomes misaligned, then You can expect serious and potentially destructive engine mIS Fires. If You find the engine stalling on You intermittently, either as You're trying to start the car or even when You idle at red lights, that's a potential sign of a faulty ECU.