Question about 1999 Chevrolet Silverado 1500

1 Answer

2002 avalanche po171-po174 code - 1999 Chevrolet Silverado 1500

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 10,319 Answers

171 is posting right fuel trim is lean

174 is posting left fuel trim is lean

can be faulty injectors not opening all the way it seems

Posted on Jul 10, 2010

5 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

csmock132
  • 4669 Answers

SOURCE: 1996 ranger 4.0 codes po171 and po174 come up on the screen

Check for vacuum leaks, especially the intake manifold gaskets. If those are o.k., clean the Mass air flow sensor.

Posted on Apr 12, 2009

moparownr
  • 667 Answers

SOURCE: code po171 7 po174

your computer is reporting bank 1 and 2 too lean, usually caused by the mass air flow (MAF) sensor, you can usually clean this sensor and reset the light. Clean it with electric cleaner or brake cleaner, make sure it is dry before reinstalling, also take care not to damage it. Hope this helps, let me know

Posted on Jun 09, 2009

  • 193 Answers

SOURCE: How do I troubleshoot service engine codes for

This is the engine lean code. Too much air is entering the engine. Intake manifold gaskets can leak, vacuum lines get old and crack. Check the operation of the EGR and PVC valves, In short it is not easy to find the problem.

Posted on Oct 01, 2010

Zeevert
  • 373 Answers

SOURCE: codes po171 and po174 0n

It sounds like you running lean; too much air, not enough gas.
Go to these links to get some additional information:
http://www.obd-codes.com/p0171
http://www.obd-codes.com/p0174


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

    • The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filtersmag-glass_10x10.gif can 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 pressuremag-glass_10x10.gif

    Posted on Mar 02, 2011

    Add Your Answer

    Uploading: 0%

    my-video-file.mp4

    Complete. Click "Add" to insert your video. Add

    ×

    Loading...
    Loading...

    Related Questions:

    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

    Po171 po174 code


    Lean bank 1 and bank 2 , and throttle actuator system fault. Check reason for lean codes 1st, vacuum leak(s), air inlet boot and hoses, or low fuel pressure / clogged filter. Repair as needed then clear codes and recheck .

    Jan 09, 2014 | Cars & Trucks

    1 Answer

    2003 Ford Expedition check engine codes PO171 & PO174


    You should be replacing all upstream oxygen sensors,
    the ones at the inlet or pipe before the converter,on all
    your vehicles at 100,000 miles

    Go to Rock Auto.Com & buy two & install yourself

    NTK 22060 $26.79 ea

    Feb 18, 2013 | 2003 Ford Expedition

    1 Answer

    How do I troubleshoot service engine codes for 2002 Ford F-150: PO174 and PO171?


    This is the engine lean code. Too much air is entering the engine. Intake manifold gaskets can leak, vacuum lines get old and crack. Check the operation of the EGR and PVC valves, In short it is not easy to find the problem.

    Sep 30, 2010 | 2002 Ford F150 Regular Cab

    1 Answer

    2006 jeep wrangler code po174


    Check wiring to sensors.

    Jul 13, 2009 | 2006 Jeep Wrangler

    1 Answer

    Code po171 7 po174


    your computer is reporting bank 1 and 2 too lean, usually caused by the mass air flow (MAF) sensor, you can usually clean this sensor and reset the light. Clean it with electric cleaner or brake cleaner, make sure it is dry before reinstalling, also take care not to damage it. Hope this helps, let me know

    Jun 09, 2009 | 1997 Ford Thunderbird LX

    1 Answer

    1996 ranger 4.0 codes po171 and po174 come up on the screen


    Check for vacuum leaks, especially the intake manifold gaskets. If those are o.k., clean the Mass air flow sensor.

    Apr 12, 2009 | 1996 Ford Ranger SuperCab

    Not finding what you are looking for?
    1999 Chevrolet Silverado 1500 Logo

    522 people viewed this question

    Ask a Question

    Usually answered in minutes!

    Top Chevrolet Experts

    yadayada
    yadayada

    Level 3 Expert

    75797 Answers

    Colin Stickland
    Colin Stickland

    Level 3 Expert

    22114 Answers

    Jeff Turcotte
    Jeff Turcotte

    Level 3 Expert

    8152 Answers

    Are you a Chevrolet Expert? Answer questions, earn points and help others

    Answer questions

    Manuals & User Guides

    Loading...