Question about Mercury Grand Marquis

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What do you think the chances are that a maf sensor is causing codes p0171 and p0174,causing the check engine light to come on?

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A dirty or defective MAF sensor could set these codes, so could a small vacuum leak.

Posted on Nov 05, 2010

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Clean the MAF Sensor---CRC MAF Cleaner
The maf sensor is fairly reliable and fairly expensive.
They just repair them,so I would say no

Vacuum leaks are the most likely,causing both banks, to drive the O2 Lean

Egr Valve worth checking out

Loose O2 Sensors

Exhaust letting air in

Ducting to throttle or air filter cover loose

Etc

Posted on Nov 05, 2010

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2001 GMC SIERRA 1500 4X4 CODES P0171 AND P0174 CHECK ENGINE LIGHT IS ON WONT PASS EMISION


Sometimes this is NOT a O/2 sensor issue ,,,,,If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.
The P0171 code could also be caused may be caused by one or more of the following: debris on MAF sensor causing an incorrect reading, improper oil level, low or high fuel pressure or Engine Control Temperature (ECT) Sensor reading inaccurate,,,,,

Mar 24, 2015 | GMC Cars & Trucks

1 Answer

Ford Taurus Engine Light is: P0171 & P0174. I am thinking a MAF Sensor


Could be a problem with the MAF sensor but if it is you should have a code for that too.
Other causes include low fuel pressure, and a vac leak or air leak in the intake hose to the MAF.
The codes mean the ECM can not make the injectors rich enough to make the O2 sensors switch back and forth.

Jul 29, 2012 | Ford Cars & Trucks

1 Answer

My lexus rx300 2001 is blowing white smoke and reading codes p0171 and p0174


Hi there:
P0171 - System Too Lean (Bank 1)
P0174 - System Too Lean (Bank 2)
Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.

You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.

A code P0171 or P0174 may mean that one or more of the following has happened:
The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
There could be a vacuum leak downstream of the MAF sensor.

Possible solutions include:
In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
Inspect all vacuum and PCV hoses, replace if necessary
Check for a dirty fuel filter and proper fuel pressure

Hope this helps.

Feb 22, 2012 | 2001 Lexus RX 300

3 Answers

Check engine light with codes P0171 & P0174, hesitation at accelleration 2001 mercury sable.


P0171 & P0174 indicate Lean burning on banks 1 and 2. The most common cause is a dirty or defective MAF (Mass Air Flow) sensor. Other causes are bad fuel filters or a broken vacuum line.

Jul 06, 2011 | 2001 Mercury Sable

1 Answer

My engine light light is on i took the car to O`REILLY the scan the car and the code is PO171,i just want to know was is that code for


p0171 is system to lean ( bank 1 ). one of the most common causes for a p0171 is a dirty mass air flow sensor ( MAF ). just clean or replace maf sensor. use maf sensor cleaner found at most auto parts stores. do not use any other cleaner. disconnect air tube just ahead of sensor, and then spray the cleaner through the screen at the wire element on the maf sensor,let cleaner soak in for several minutes. then give it another shot of cleaner. let it set another 5 minutes. then reconnect air tube and start engine. or you can follow directions on back of maf spray can. if the lean code comes back, you may have to replace maf sensor. unless you have a vacuum leak. Ford p0171 AND p0174 lean codes can also be set by a bad EGR differential pressure sensor. These sensors have a very high failure rate once a vehicle has more than about 60,000 miles on the odometer or is more than five or six years old. hope this helps !

May 28, 2011 | Ford Escort Cars & Trucks

1 Answer

Engine check light on error code 1 is P0171 system too lean bank 1 error code 2 is P0174 system too lean bank 2


P0171 system too lean bank 1
P0174 system too lean bank 2
links to information on the codes

it means that the O2 sensors in your vehicle detected a lean condition in their respective banks. this could be caused by a dirty MAF (mass air flow) sensor or a vacuum leak downstream from the MAF sensor

sometimes you can clean the MAF with electronics cleaner or brake cleaner but be sure to take it off the vehicle first. be careful not to damage the MAF while spraying the cleaner, and allow it to dry completely before installing it on the vehicle.

May 21, 2011 | 2001 Jaguar S-Type

1 Answer

P0171 and P0174 Left and Right bank lean trouble codes pulled from ECU. Check Engine Light illuminated.


P0171 = system too lean bank 1
P0174 = system too lean bank 2

The fuel/air mixture is too lean for the entire engine. The fuel pump pressure could be too low. The fuel pump pressure regulator could be at fault. There could be an air leak downstream of the MAF sensor. MAF sensor (hot wire type) could be dirty. Check for intake manifold vacuum leaks. The engine coolant temp sensor and/or the intake air temp sensor could be faulty (stuck at full hot mode).

Feb 26, 2011 | 2008 Hyundai Entourage

1 Answer

99 CHEVY trouble shoot code P0171


LEAN TROUBLE CODES (P0171 or P0174) A code P0171 or P0174 indicate the engine is running lean. This means there is too much air and/or not enough fuel. You can confirm the engine is running lean by looking at Short Term Fuel Trim (STFT) and Long Term Fuel Trim (LTFT). Normally, STFT and LTFT should be plus or minus 8 from zero. If STFT and/or LTFT are more than about +10 or higher, it indicates the engine is running LEAN. Negative numbers (-10 or more) indicates the engine is running RICH. A lean fuel condition can be caused by:

* Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (use a fuel pressure gauge to check fuel pressure at idle)

* Dirty fuel injectors. (try cleaning the injectors)

* Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)

* Leaky EGR valve. (Check operation of EGR valve)

* Leaky PCV Valve or hose. (Check valve and hose connections)

* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)

______________________________-- Causes A code P0171 may mean that one or more of the following has happened:
  • The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
  • There could be a vacuum leak downstream of the MAF sensor.
Possible Solutions Possible solutions include:
  • In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
  • Inspect all vacuum and PCV hoses, replace if necessary
  • Check for a dirty fuel filter and proper fuel pressure

Jan 02, 2010 | 2001 Dodge Ram 1500 Truck 2WD

2 Answers

99blazer s10 trouble codes p171/p174


P0171 - System Too Lean (Bank 1)
Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

A code P0171 may mean that one or more of the following has happened:
  • The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
  • There could be a vacuum leak downstream of the MAF sensor.
Possible solutions include:
  • In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
  • Inspect all vacuum and PCV hoses, replace if necessary
  • Check for a dirty fuel filter and proper fuel pressure

P0174 is identical to P0171, except it indicates the problem exists on Bank 2 as well.

Nov 22, 2009 | 1999 Chevrolet S-10 Pickup

2 Answers

96 mercuy grand marquie check eng light, i get a p0171 and p0174 how do i fix this.


Could be the MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. There could also be a vacuum leak downstream of the MAF sensor which is more likely. You should inspect all the vacuum hoses and try cleaning the MAF sensor. Use only electronics cleaner to clean and let it dry before reinstalling.

If none of those work, then it may be caused by a dirty fuel filter or faulty fuel pump or clogged fuel injectors, but these are less likely

Aug 26, 2009 | 1996 Mercury Grand Marquis

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