Code 42
WARNING: This page is about a different car, the 1990 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
- Intermittent HEGO signal (SIG or GND circuit).
- Vane Airflow (VAF) meter indicating incorrect airflow, check for high voltage output due to sticking air vane (flapper door).
- Excessive fuel flow, pressure regulator vacuum supply disconnected or blocked fuel return line.
- Excessive fuel flow, damaged or stuck open injector(s).