Codes 41 and 42 Ford Probe I

Codes 41 and 42

1. Intermittent HEGO circuit (SIG or GND circuit).
2. Contaminated HEGO sensor, lead or silicone fouled.

1. Low fuel pressure at WOT, fuel pump or restricted supply.
2. Low fuel flow at WOT, injectors plugged or low battery voltage (less than 11 volts).

1. Check for faulty HEGO signal (Signal or Ground circuit).

1. If Code 42 also displayed, service it first.
2. Excessive fuel pressure, check regulator vacuum line and fuel supply line.
3. Excessive fuel flow, check for damaged injector pintles or injector stuck open.

1. If Code 41 also displayed, service it first.
2. Low fuel pressure, low pressure pump or restricted fuel supply.
3. Low fuel flow, clogged injectors or low battery voltage.