Skip the auto shop - Our mechanics make house calls

Q: P0191 code coming on - I already changed the fuel pump, fuel pressure sensor, and driver fuel module

asked by on

Have code p0191 changed fuel pump driver fuel module and fps what other this guy could it be and does my truck have a fuel regulator

My car has 150000 miles.
My car has an automatic transmission.

A: Hi there. Check the fuel pressure on the ra...

Hi there. Check the fuel pressure on the rail with the engine off and the key on, with the engine running at idle, and the engine running at 2000 rpm. If the fuel pressure is greater than 35 psi, then the fuel pressure sensor has failed. If the fuel pressure is lower than 35 psi, then the fuel pressure regulator has failed or there is a plugged fuel filter. If you need further assistance troubleshooting your vehicle, then I recommend having a certified professional, like one from YourMechanic, diagnose the Check Engine code in person to ensure that the correct repair is made.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Can a collision in the front of my car cause a mass air flow sensor to malfunction? I need to make a claim for the insurance.

Unless the sensor has been physically damaged by the accident you were in, it would be impossible to know if it was damaged by the accident or not. The MAF sensor is a common sensor to fail on these vehicles...

Q: I need the cylinder head replaced and intake manifold. How much does that usually cost

Hi There, What you are describing is something that can be repaired by a few different methods. Depending on whether or not there was any damage to the cylinder head and to what extent the damage is repairable will determine...

Q: Just replaced the fuel pump with a prime choice off of Amazon and put in brand new fuel lines. I can smell the gas but I don't hear the fuel.

Hi there. From the description you have provided, you may be dealing with a combination of problems concerning the fuel pump replacement in your vehicle. First being, it could be the replacement fuel pump, is incorrect by application. Second being,...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.