Question about 2000 Ford Taurus

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Codes p0171 and p0174.help please.what is the most common cause

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  • Ford Master
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The fuel filter is restricted,or the fuel pump is weak.

Posted on Jun 01, 2010

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Posted on Jan 02, 2017

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I have a 2006 gmc envoy,check engine light keeps coming on,the code says it's a vacum leak,my ? is how common is this and where would i start?


What is the code ? No code specifically say's there is a vacuum leak . P0171 - P0174 lean condition ! Could be caused by lack of fuel as well , plugged injectors , fuel filter , low fuel pump pressure etc...
How to Diagnose OBD II Fault Codes P0171 and P0174 Leaking Intake and EGR...

Mar 23, 2017 | GMC Cars & Trucks

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Code p0171 and p0174


P0171 possible cheap fix

Feb 21, 2015 | 2002 GMC Sierra 1500

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WHAT CAN I DO TO FIX MY AUTO HAVE CODES P0171 P0174 01000 P2195 P2197 WHAT ARE THE CODES.


P0171 & P0174 are lean codes.this can be cause by a vacuum leak. One of the symptoms is a ruff idle when cold.

You can listen for it or you can have it smoke checked by a shop. Most common causes are intake plenum gaskets and rotted PVC hoses.

Feb 18, 2015 | 2004 Lincoln LS

1 Answer

What are the probable causes of DTCs P0171, P0174, and P0455?


Smoke testing for codes P0171 P0174 - YouTube

? 5:48
www.youtube.com/watch?v=kZsqEfP-5zM
Jan 18, 2011 - Uploaded by realfixesrealfast Smoke testing for codes P0171 P0174 .... I have a 1995 ford mustang gt 5.0 and it keeps having a Fault code 176 pop up. ....Ford Explorer P0174 code intake air leak check engine light by froggy - Duration: 16:11. by froggy ...

Sep 27, 2013 | 1999 Ford Explorer

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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

Ford windstar check engine light comes on after stopping when starting to get moving again shows p0171 & p0174 codes why??


P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks. P0174 OBD-II Trouble Code


Technical Description

System Too Lean (Bank 2)


What does that mean?

Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust.

Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.

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Thanks.


Dec 17, 2009 | 2002 Ford Windstar Cargo

1 Answer

My cadillac deville has the following engine codes when hooed up: P0106, P0121, P0171, P0174, P0335, P0340, P0385, P0442, P0506, P0506, P0507, P0601.


click on the below links for code details.
P0106

P0121

P0171

P0174


P0335


P0340

P0385

P0442

P0506

P0507

P0601.

all of the above codes seem to have a common cause, they all list a bad ecm (computer) as being a cause, and the last code P0601 points specifically to a bad computer. sorry for the bad news, hope this helps.

Dec 06, 2009 | 2000 Cadillac DeVille

1 Answer

Can't find cause of p0171/p0174 error on my TJ


Please read thoroughly the explanation of these fault codes and the possible sources of the code at the links provided. But based on the fault codes I think you have a engine vacuum leak.

P0171 Jeep Fuel System 1 1 Lean


P0174 Jeep Fuel System 2 1 Lean

Jul 05, 2017 | 1997 Jeep Tj

4 Answers

P0171 and p0174 codes


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

If a car has a check engine light on and has P0171 and P0174 codes stored, the most likely cause is a vacuum leak. These codes are set by the car’s computer when it sees too much oxygen in the exhaust. Excessive oxygen readings in the exhaust will set lean codes. This does not mean that the oxygen sensors are defective. It is a common mistake for people to replace oxygen sensors when lean codes are present. Just because the code is related to oxygen sensor readings, it doesn’t mean that the oxygen sensors are bad. If both of these codes are stored this means that both banks of the engine have excessive oxygen in the exhaust. If the oxygen sensors are replaced it’s most likely that the same codes will reappear. It is very uncommon for two oxygen sensors to fail at the same time.

Therefore the most likely cause of P0171 and P0174 codes is a vacuum leak. The source of a vacuum leak can be one of many things. The most common cause of a vacuum leak is a leaky hose. Vacuum hoses over time can become dry and brittle. The rubber deteriorates and can leak causing a vacuum loss. Many times a leaky vacuum hose can be found by listening for a hissing sound. A large vacuum leak can even make the car run rough at idle. In some cases it will not idle without feathering the gas pedal.

Sep 10, 2009 | 2002 Jaguar X-Type

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