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I HAVE A ENGINE CODE OF P0171 AND P0174? - 2003 GMC Sierra 2500HD

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This code are similar to engine misfire, chek the fuel system and pressure, air intake ratio, (injectors, fuel pump, maf, iac, vacuum hose, intake manifold), you mustcheck all this.

Posted on Nov 09, 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

1 Answer

Im getting P0171 code- lean .


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Jan 27, 2016 | Cars & Trucks

1 Answer

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

3 Answers

Code p0171 and p0174


P0171 possible cheap fix

Feb 21, 2015 | 2002 GMC Sierra 1500

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

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


Smoke testing for codes P0171 P0174 - YouTube

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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

1 Answer

2004 x-type 3.0 v6 152,000 miles showed codes P0171, P0174, P2096, P2098, P0101, P0171 pd, P1000.


check for vacuum leaks or a faulty mass air flow sensor. all the codes have to do with engine too lean(too much air).

Jun 09, 2012 | Cars & Trucks

1 Answer

Engine service light illuminated. Diagnostic revealed P0171 and P0174 what does that mean?


code P0171 P0174?? sorry these are not nissan codes but the code readers own codes so return to where the reading was done and ask them

Dec 14, 2009 | 2000 Nissan Maxima

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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