P1251 Toyota Hilux
P1251 is the most prevalent code for Hilux stepper problems. The codes are only a warning that you may have a problem with the Hilux turbocharger electric motor. This code, in the lack of further evidence, implies that the stepper motor has been changed. It’s also unusual for both the turbo and stepper motors to fail at the same time. Low boost with no evident physical signs is most likely due to a stepper motor malfunction. Any trouble codes that the ECU may have thrown should be investigated.