Question

I got the engine code P0191 on my Ford Taurus: Could this cause the engine to surge?

Answer 1

Yes, check the fuel pressure

Diagnostic Trouble Code (DTC) P0191 indicates the FRP sensor signal has exceeded the Self-Test Calibration limits and can only be retrieved during KOEO and KOER Self-Test. DTC P0191 (FRP) circuit fault low limit is 1.7 volts at 551 kPa (80 psi) and 3.8 volts at 930 kPa (135 psi) for the high limit.

Possible causes:

High pressure.
Low fuel pressure.
Damaged FRP sensor.
Excessive resistance.
Low or no fuel.
Key on.
Verify there is sufficient fuel (1/8 tank or greater).
Key off.
Fuel pressure gauge connected to Schrader valve.
Key on.
Is the pressure reading between 551 kPa (80 psi) and 930 kPa (135 psi)?