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・Save up to 30%

Get a quote

What others are asking

Q: The engine stalls when I put the car in reverse, but if I go past reverse into drive there is not an issue.

Hi there. Usually when you shift into reverse and engage the brake it will cause the engine RPM to drop; as it's creating a load against the transmission and the engine. If the engine stalls, it may be caused by...

Q: Car clicking when starting.

The starter solenoids on the expeditions are known to just quit with no warning. Before replacing the solenoid however, the battery should be fully charged and load-tested to eliminate it from being the issue. The solenoid is tested via a...

Q: My car hesitate slightly during start up. What could be the problem?

This may be caused by many things as there are a number of systems at work when your car's engine first starts up. This may likely be an air/fuel flow issue since the car does in fact start. Typically, the...

Related articles

How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.