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Fuel pressure not correct? What could be the cause

My 4runner hesitates on accelaration and sometimes seems like its not getting any fuel. Code P0171 is coming up on code reader

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You checked the fuel pressure? What is it. P0171 says system lean, this can be a fuel pressure issue or lack of it, it can be a defective O2 sensor or wiring or an engine vacuum leak at the intake manifold or any vacuum hose.

Posted on Nov 01, 2012

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Posted on Jan 02, 2017

SOURCE: P0171 Code (Lean Fuel Bank 1) Engine light on

you nead to check all you vacuum lines for leaks it sounds like you have a vacuum leak or the o2 sensor is going bad on bank 1 **** i still say vacuum leak

Posted on Nov 23, 2008

  • 5 Answers

SOURCE: Where is the fuel pressure regulator located on an 2002 f150 v6?

in the center of the motor,in the rear on the fuel rail

Posted on Jan 19, 2009

localwonder
  • 6784 Answers

SOURCE: CTS check engine light code P0451

Hi. the fuel pressure sensor is part of the fuel pump assembly. You will have to remove the fuel pump to replace this. I would go ahead and replace the fuel pump while you are there.You will have to Pull the strainer off the fuel pump and discard it. remove the retaining clip for the fuel pressure regulator so that you can remove the fuel pressure regulator. Disconnect the electrical connections for the fuel pumps and the fuel level sensor. Remove the retaining clip for the fuel level sensor and remove the fuel level sensor by squeezing the locking tangs. the sensor is incorporated in this area.

Please rate and god bless.

Posted on Mar 26, 2009

bitchn65cuda
  • 70 Answers

SOURCE: out 95 neon has a p0171 system too lean (bank 1)

you have a air leak, check your vaccum hoses, will take time

Posted on Apr 19, 2009

  • 16 Answers

SOURCE: Showing check engine - then the code reader is p1133 and p0171

miles...?
P1135 Air-Fuel Sensor Heater Circuit Response.
the air fuel sensor malfunction is the main problem and thats causing the code p0171.
Hard to start o long cranking time to starter is gona be the first symtoms.
replace upstream. (the air fuel Sensor and the oxygen sensor is the same)

Posted on Mar 24, 2010

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Interpret trouble code p0171


This code indicates a lean condition on bank one of the engine. Possible dirty/defective MAF sensor/vacuum leak/low fuel pressure on bank one/ defective 02 sensor. The best thing to do would be to monitor live scan data and see what may be causing this issue before tossing unneccessary parts at the vehicle

Mar 10, 2016 | 2006 Toyota 4Runner

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Toyota Corolla Code P0171 Check Engine light


Code P0171 on Toyota Corolla Q: What could cause the code P0171 on 2002 Toyota Corolla? A: The code P0171 reads "System Too Lean (Bank 1)". This means that the air-fuel mixture coming in to the engine is too lean, or there is too much air and too little fuel. This could be caused by a number of reasons, such as bad airflow sensor, vacuum leaks, low fuel pressure, clogged fuel injectors, etc. To know exactly what caused the problem, your mechanic can do a few tests.
From my experience, the airflow sensor problems are fairly common; sometimes the sensor just gets dirty and gives false air flow readings causing lean condition. Again, your mechanic can test it.
If the airflow sensor is causing the lean condition, it will need to be replaced. If the sensor is just dirty, your mechanic may suggest to clean it (cleaning the airflow sensor is very delicate procedure) as a temporary solution - sometimes this could work.

on Dec 07, 2009 | Toyota Corolla Cars & Trucks

1 Answer

2001 nissan sentra 1.8L 4cyl. running codes P0105:P1605:P0171:P0325... engine idles fine when in park just not in gear, in gear it shakes pretty bad, also hesitates to accelerate when you press on gas...


code po105 refers to manifold absolute pressure(MAP)sensor/barometric pressure (BHARO) sensor -circuit malfunction==causes--wiring MAP sensor--BARO sensor--ECM
code p0171 refers to system to lean bank 1===causes intake/exhaust leak---AIR system MAF/MAP sensor fuel pressure /pump /injectors--HO2SW
code p0325 refers to knock sensor(KS) 1 bank 1-circuit malfunction====causes--wiring ---poor connections---KS
Check the exhaust flexible pipe at the manifold for cracks
have a fuel pressure test done on the fuel manifold to determine either pump/ filter or pressure regulator.
replace HO2S unit

Sep 21, 2013 | Cars & Trucks

1 Answer

Dakota p0171 p0174 taurus


code p0171 refers to system to lean bank 1==causes intake /exhaust leak--AIR system--MAP/MAF sensor--fuel pressure/pump--injectors--HO2s Have a fuel pressure test done on the fuel manifold to check for blocked filter/faulty pump/fuel pressure regulator faults
code p0174 refers to system to lean bank 2 --same causes including hose connection/s
code p0420 refers to catalytic converter system -bank 1 efficiency below threshold==causes catalytic converter--wiring--HO23. Check the cat converter is not cracked inside and the oxygen sensor is working.

Sep 06, 2013 | 2009 Citroen C8 2.0

1 Answer

Car chugs and sometimes stalls while idoling. codes that come up are P0771, P0128, P0171, and P2195 any help is appreciated


First code P0771 is shift solenoid E is stuck or has a performance problem.Code P0128 could be low coolant,leaking or stuck open thermostat,faulty coolant fan (running to much) or faulty coolant temperature sensor.Code P0171 fuel system to lean usally its a dirty mas air flow sensor or a weak fuel pump,fuel filter or fuel pressure regulator. Code P2195 is oxygen sensor stuck lean bank1 sensor 1.I would check for low fuel pressure causing the lean condition or faulty injectors (clogged).Also i would replace the coolant temperature sensor.

Oct 25, 2012 | 2006 Ford Fusion

1 Answer

Volkswagen jetta code P0171


P0171 VOLKSWAGEN - System Too Lean engine cylinder Bank 1
Possible causes- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection
P0455 VOLKSWAGEN - EVAP System (fuel vapor storage and control) Large Leak Detected
Possible causes- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking

Aug 09, 2012 | Volkswagen Cabrio Cars & Trucks

1 Answer

My friends 1995 toyota camry v6 le seems to have an accelaration issue. The vehicle hesitate on accelarating when the gas is pedal is deprressed so the car jerks a little when you are accelerating from a...


There is a variety of causes possible:

- spark plugs fouled or worn (likely after about 50000 km)
- low fuel pressure (maybe)
- ignition timing not correct (an ECU problem, is there any check engine light?)
- air leak into the intake manifold (the most likely)

These engines develop a split in the big hose from the air cleaner to the air flow body. Look for that first.

Dec 20, 2011 | 1995 Toyota Camry

1 Answer

Keeps giving P0171 reading any help


P0171- System Too Lean (Bank 1)

The adaptive fuel strategy in the vehicle's computer constantly monitors the fuel delivery system to make sure the engine is running at an optimum air to fuel ratio, which is 14.7:1. The computer adjusts injector pulse width to regulate the amount of fuel going into the engine. The oxygen sensors relay information to the Powertrain Control Module (computer), informing it of the oxygen content in the exhaust. This information is translated by the computer, and used to determine if more or less fuel is needed. The computer will then adjust fuel flow (and possibly other related engine operating characteristics), to keep the correct air fuel mixture. This loop continues as long as the engine is running.

A P0171 check engine light code is set when the computer has reached a rich calibration limit and can not add enough fuel to maintain the correct mixture.

Possible Causes:
The following is an overview of P0171 check engine light code possible causes.

Fuel System:

Leaking or faulty fuel pressure regulator
Plugged or dirty fuel filter or lines
Fuel pump weak or defective check valve
Injectors leaking or faulty
Low fuel pressure or running out of fuel
Leaking EVAP system components
Faulty FRP (Fuel Rail Pressure Sensor)

Air Intake System

Vacuum leaks
Contaminated, damaged or faulty Mass Air Flow sensor
PCV valve leak or stuck open
Air induction turbulance caused by wrong filter
Oil dipstick not seated
Air leaks after the Mass Air Flow Sensor (MAF)
Oil coated aftermarket air filter

Exhaust System

Any exhaust leak before or near the oxygen sensors

EGR System

Vacuum line disconnected from EGR System Module (ESM)
EGR valve, tube or gasket leak
EGR vacuum regulator valve leaking

Secondary Air Injection System

Mechanically stuck secondary air injection valve

Diagnostic Help:
A very thorough discussion of how to approach and repair a P0171 check engine light code can be found here. If you need further assistance let us know. Please be sure to stop back in and visit some of our other very useful site features to lear more about your car's emissions system.

Hope this helps (remember to rate this answer).

Jan 22, 2011 | 2000 Volkswagen Beetle

1 Answer

My 98 acura RL, does not accelarate when i press the accelarator, at times, it takes time for the engine to crank after i drove it for sometime


how it seems that the engine is lossings fuel pressure i would get a fuel pressure check done and also change the fuel filter if that doesn't help you might have a bad sensor. is the check engine light on? if so then i would get it scanned and see what that pulls up.

Jun 09, 2009 | 2007 Acura RL Sedan

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