Question about 1999 Ford Explorer

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Failed emmissions test P0171 System too lean(bank1)(2) P0174 System too lean (bank2)

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Posted on Jan 14, 2013

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SOURCE: check engine light on

Generally when these codes appear it is due to insufficient fuel pressure. Test your fuel pump to ensure it is within specs. Have you changed your fuel filter?

Posted on Jan 15, 2009

chuck943
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SOURCE: OBD codes P0171 and P0174

Look on the passenger side of the intake at the rubber elbow attached to the big black plastic tube and then to the intake manifold. Make sure it is not sucking shut and maybe a small hole in the bottom of it.

Posted on Mar 20, 2009

  • 73 Answers

SOURCE: 1998 lincolm navigator trouble code p0171 and

you have a vaccum leak

Posted on Jul 01, 2009

jknrvega
  • 58 Answers

SOURCE: My check engine light is on. I have a For F-150

one common concern ive seen is the intake manifold gaskets leaking and causing lean codes

Posted on Jan 09, 2010

SOURCE: I have a code reader

P0171 - Fuel Injection System Too Lean Bank 1
Possible Causes:
- Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection

P0174 - Fuel Injection System Too Lean Bank 2
Possible Causes:
- Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection

What Causes These Codes: Fuel injection system does not operate properly. The amount of mixture ratio compensation is too large. (The mixture ratio is too rich.) The Powertrain Control Module (PCM) monitors the engine Air/Fuel mixture ratio, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The PCM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios. In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the PCM judges the condition as the fuel injection system malfunction and light up the engine light. The codes is usually set when there is an intake leak after the air flow meter, before replacing any parts check for loose or broken hoses and intake gasket leak. On Ford some models dirty air filter, and dirty or faulty air flow sensor are the cause of the problem.

Posted on Jan 16, 2011

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2 Answers

It failed the emissions test. What do the following codes mean? P0171 and P0174


PO171 System too Lean Bank
P0174 Fuel Injection System Too Lean Bank 2

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 replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.

Mar 13, 2015 | 2002 Ford Windstar

1 Answer

Po171 and po174 oxygen sensors for 2002 Chevrolet Silverado 2500hd w/6.0 litre engine - truck has 12 - how do I find out codes?


your truck should only have 4 o2 sensors two upstream and two down stream. P0171=system too lean, P0174 I= bank2 sensor1

Feb 11, 2015 | 2002 Chevrolet Silverado 2500HD

1 Answer

4 Codes in computer


code p0128 indicates a mechanical fault ( could be the thermostat stuck open)
code p0174 -system too lean -bank2 ===causes --intake /exhaust leak--fuel pressure/pump--injectors--AIR system--hose connection/s
code po171 refers to system too lean bank 1 same as po174 with the HO2S sensor being the culprit. As to all being related . only by way of the o2 sensors
code p0442 is not connected to the first 3 as it is in a different section of the fuel system

Apr 09, 2014 | 2003 Saturn VUE

1 Answer

Engine light on


P0171 ; Fuel Trim System Lean (Bank 1)
P0174; Fuel Trim too Lean (Bank 2)
fuel trim is system to modify injector pulse if system go lean it will go rich when the system is too much lean and is max.rich it code
look for 02 sensor bank 1 and 2 data
hope it helps

Mar 31, 2014 | 2003 Chevrolet Malibu

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

2 Answers

I have 97 tahoe with the dtc list as: p0171 and p0174,p1345


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 filter 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.

Feb 09, 2011 | 1997 Chevrolet Tahoe

2 Answers

P0313;Misfire Detected with low fuel P0171-System too lean{bank1} P0174 System too lean{bank2} drive cycle


P0313 - Misfire Detected with Low Fuel
P0174 -System too Lean (Bank 2).
P0171 -System too Lean (Bank 1).

P0171 and P0174 mean "system too lean" for banks 1

Aug 24, 2010 | 2000 BMW 3 Series

1 Answer

2005 hyundai santa fe check engine light on... p0171 and p0174 any ideas to repair it.


Definition of P0171 is Applied to All Manufacturers Powertrain: System Too Lean Bank 1
Definition of P0174 is Applied to All Manufacturers Powertrain: System Too Lean Bank 2

Nov 03, 2009 | 2005 Hyundai Santa Fe

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