Question about 2001 Chevrolet Silverado 1500

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Lean fuel mixture on both banks, truck surges and stalls

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Check fuel pressure. these are bad about the intake manifolds leaking. esp when cold.

Posted on May 31, 2010

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What does it mean when it said to lean bank 1


It means that one side of the engine cylinders are running too lean of a fuel mixture Bank one is the left side of the engine. Put a fuel injector cleaner in the gas tank first. Once it has had time to do its work, test again. If it's still lean, then look at the injectors and the control module for a fix.

May 25, 2014 | 2006 GMC Envoy

1 Answer

O4 sebring, PO175, PO174 codes?


Sounds like a problem with one of the O2 sensors.
Code 174 is bank two being too lean, and 175 is bank two being too rich. The computer tries to keep the fuel mixture switching back and forth between rich and lean. If the sensor is "lazy" the computer will make the mixture too rich or lean trying to get the sensor to react.
A mechanic can watch the sensor performance with a scanner to see what they are doing. You have two sensors on each bank.

Apr 06, 2013 | Cars & Trucks

1 Answer

System too lean bank 2 mazda mpv


Code 174 means the O2 sensor is telling the computer the fuel mixture on bank two is too lean and the computer can not make the injectors give enough fuel to make it rich.
The problem could be the O2 sensor, or it really could be a fuel problem.
Bank two is the side with cylinder number 2 on a V6 engine.

Feb 06, 2013 | 2004 Mazda MPV

1 Answer

Just returned from Autozone where I had them put the code reading computer on. Lots of codes popped up but it appears the most possible conclusion is lean air/fuel mixture in bank 1 and bank 2


EGR Valve and or EGR Senor
But then again Autozone test should have told you so if these are the problem, but EGR Valve and Senor control air flow.

Dec 26, 2012 | 2003 Mazda MPV

1 Answer

Down to the final OB code on my truck...Po174


P0174 FORD - Fuel Injection System Too lean Bank 2xicon.jpghttp://engine-codes.com/p0174_ford.htmlForum CodePossible 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 Tech notes 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.

It's a very common problem for the Ford Windstar. Here a link to a web site with information how to repair:
When is the code detected?- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.) Symptoms- Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel ConsumptionP0174 FORD Description 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.

Oct 08, 2012 | Cars & Trucks

1 Answer

Can .p1151, .p0174, p0401, .p0153 all be related


Not exactly.
Codes 1151 - 174 - 153 all point to a faulty O2 sensor bank 2 sensor one. That is the sensor ahead of the catalytic converter. All three codes state the sensor is reading the fuel mixture is too lean. It could be lean but you should also have codes for the sensor on bank one.
Code 401 is for a low air flow for the EGR valve which would probably be a different issue. Its possible the EGR valve is faulty and that could affect the fuel mixture but usually for the EGR to cause a lean mixture the EGR would cause a vac leak not fail to open.

Oct 02, 2012 | 1997 Ford Ranger SuperCab

1 Answer

I have a code reader and the code is P0171 P0174 System too lean. what makes the system too lean?


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.

Jan 16, 2011 | 2000 Ford Explorer

2 Answers

A po171 code came on my scanner i need to know


system too lean in bank 1. clean your mass airflow sensor, replace fuel filter. iff all else fails check you fuel pump.

Nov 06, 2009 | 1998 Ford Contour

1 Answer

Diagnostic Codes p0171 bank 1, and p0174 bank 2 (too lean)


Those codes are for the oxygen sensors, lean fuel mixture on both banks. Change them, problem with stalling and rough idle should go away.

Apr 23, 2009 | Ford Expedition Cars & Trucks

1 Answer

What are the descriptions for these DTC's PO171 & PO174 ?


P0171 - System too Lean (Bank 1)
P0174 - System too Lean (Bank 2)

They have to do with fueling the engine. Usually when a car is running a less-than-optimal fuel mixture, it's traceable to O2 sensors, mass airflow sensor, or sometimes a coolant temperature sensor. These all have a direct effect on the fuel mixture. If your O2 sensors have been in the car for more than 60k miles, I'd change them first, as they have the biggest impact on fuel mixture. I don't know what year your car is, but if it's 95 or older, there is only one sensor per bank of cylinders. If it's 96 or newer, you'll have four - two before the catalytic converters, and two after them. The ones you'd want to change are the pre-cat O2 sensors, closest to the engine. These are used for determining fuel mixture. The post-cat O2 sensors are there for monitoring the cats' efficiency.

Aug 03, 2008 | Chevrolet Chevy Cars & Trucks

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