Question about 2000 Pontiac Grand Prix

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I am told I need new fuel pump to clear a P0171 code and to meet emission requirements. Cost is $600.00. Is this correct?

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  • mmsintl Aug 27, 2010

    Thanks for all the suggestions. I have already done thse checks and replaced the mass air flow sensor 10 months ago.

  • mmsintl Aug 27, 2010

    Thanks. I've gone throuh a lot of other steps - checking for leaks,pvc valve, replaced mass air flow sensor, etc. Fuel pressure is low under load.

  • mmsintl Aug 27, 2010

    Thanks for suggestion. I got a cost of $253 for the fuel pump assembly so cost of $600 is high.

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It can be, but you can do some checks yourself without needing a scanner..... check for vacuum leaks(broken vacuum lines,broken pcv valve, stuck open pcv valve), bad intake manifold gaskets causing a vacuum leak, low fuel pressure(need a fuel pressure tester, possible rent at autozone) dirty mass air flow sensor, mass air flow sensor can be a three or two wire sensor, it's after the air cleaner on the tube that goes to the intake, if you see dirt build up on the sensor you can clean it with a special cleaner made for maf sensors, be careful not to poke at the wires on the sensor, break a wire,,buy a new sensor!!!...there are more things you can check but you need a scanner!!

Posted on Aug 26, 2010

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You can call a parts store and see what a fuel pump costs, but I would call some shops and see whom is the cheapest and has a good rep. Good Luck Tim

Posted on Aug 26, 2010

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Possibly. P0171 is lean, there are many things that could cause this, if fuel pressure is low under load then you must start there, and get fuel pressure up to spec.

Posted on Aug 26, 2010

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1 Answer

Error codes P0171 and P0128. I put fuel injector cleaner in the gas tank but the engine light is still on. Any suggestions?


P0171 is a lean code indicating more air than fuel being burned in the engine. P0128 is refering to the coolant temperature being below operating temperature. Usually this is caused by a defective thermostat. There are many reasons for a lean code to develop. This code may be due to the thermostat not operating correctly. Have the thermostat replaced and clear the codes to see if P0171 returns. If it does, further diagnostics will be required

Jan 04, 2016 | 2006 Buick Rendezvous

1 Answer

Type p0171


It is a generic OBD2 power train Code. The same solution could be applied to all other vehicles as well.
Error Code: P0171
Description:
Fuel Trim (FT), System too Lean, Bank 1
Possible Causes:
- Fuel pump pressure too high or regulating valve stuck closed.
- Intake/ exhaust leak.
- Secondary air injection (AIR) system.
- Manifold absolute pressure (MAP) sensor.
- Mass air flow (MAF) sensor.
- Fuel pressure/pump.
- Fuel Injector(s).
- Evaporative emission (EVAP) canister purge valve.
- Heated oxygen sensor (HO2S).
Solutions:
-Usually, simply cleaning the Mass air flow (MAF) sensor helps solve the problem.
- It is best to take MAF off and spray it with electronics cleaner or high flash point solvent.
- Inspect all vacuum and PCV hoses, replace if necessary.
- Check for a dirty fuel filter and proper fuel pressure.

Sep 26, 2013 | 2000 Toyota Corolla

2 Answers

Code p0171 on 98 ford ranger


Well code 171 means the O2 sensor is telling the computer the fuel mixture is too lean and the computer can not make it go rich by increasing on time for the injectors.
The problem could be the O2 sensor, or low fuel pressure, or several other factors.

Feb 21, 2013 | 1998 Ford Ranger SuperCab

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

Code P0171 light on when the car kia rio 2004 work in gas


P0171 is the code for "Fuel System Too Lean." Which means that there is too much air (and too little fuel) in the combustion chamber.

There are quite a few things that could cause this code:
- Faulty fuel delivery system (fuel pump)
- Clogged fuel injectors ($3 fuel injector cleaner might clear it up)
- Faulty fuel injectors
- Leak in intake or exhaust system
- Faulty Mass Air Flow Sensor
- Faulty Throttle Position Sensor

Dec 20, 2010 | 2004 Kia Rio

1 Answer

My 2001 Corolla displays P0171 after it idles for a minute or two. If I drive it hesitates (especially under hard acceleration) and starts also displaying P0300, P0301, and P0302. If I clear the codes...


po171 is lean on bank 1--===causes --MAF/VAF sensors --injectors ---HO2S (heated oxygen sensor)
po300 is random misfires and po301, 2, 3 4 5 6 etc is the cylinder that is misfiring
most likely that the fuel pressure is below the required pressure either from the pump or blocked filter or the tank not venting properly--- (EVAP) problem
check the fuel pressure ( minimum of 45-65psi) --problem pressure regulator , pump or filter
replace the heated oxygen sensor on bank 1 ( in the exhaust manifold before the cat converter) as it reports to the ECM to get the correct air/fuel mix

Jul 19, 2017 | 2001 Toyota Corolla

1 Answer

I have replaced the port seals, isolater bolts, cleaned the EGR ports, plugs and wires, and chanced the air filter. I was getting both 171 and 174 codes. Now after 60 miles or so, pulled the codes again...


P0171 is a lean fuel condition . The computer reflashed has nothing to do with it . Vacuum leak intake manifold probably . If both P0171 & P0174 were back could be fuel pump low flow or restricted fuel filter . or O2 sensor problem or mass airflow sensor. Suggest you take it to a qualified repair shop to have it diagnosed .
Ford 150 P0171 P0174 Trouble Codes vacuum leak water test

Diagnosing Faulty Mass Air Flow Sensor P0171 P0174 Lean Codes

Aug 10, 2017 | 2000 Ford Windstar

4 Answers

The code is p0442 what dose that mean and what part do i need


this is a small leak in the evaporative emission control system.Most common cause is a loose or faulty gas cap but not always, Sometimes the check valve in the gas cap doesn't seat properly allowing the gas tank pressure to bleed down. The EVAP system needs to see a positive pressure in the tank.

Jun 05, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

Codes


Your sensors are reading correctly so leave them alone. What you have is a fuel delivery issue. Your MAF sensor is telling your engine to lean your fuel mixture. You need to remove and clean or replace (is better) the MAF. But first replace your PVC valve and clean your ERG valve.

Jan 20, 2010 | 2000 Dodge Intrepid

1 Answer

1998 camry, 4cyl. P0171, P1130 toruble codes.


Hi.. On your question the definition of the codes are:
P0171, System to lean ( Fuel trim)
P1130, Air / Fuel sensor circuit range ? performance malfuntion This code is exclusive california Emissions). Oxigen sensor Performance malfuntion.
The first step you need to do is Check the Oxigen ( O2 sensor)
Connections The front and the rear one.
Check the condition of the Air filter Replace if need.
Check Spark plug Replace if need.
Check Fuel condition, Replace fuel filter if need.
And Clear the Codes if averything is good.
If the code P1130 return Replace the Air fuel ratio sensor..

Ok.. I hope this help on your question. If need more info letme know.

Thankyou for use fixya...

Jul 26, 2009 | 1998 Toyota Camry

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