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2003 5.3 suburban P0171 and P0174 Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Engine ODB2 Fault Codes Poncho2 New User Jan 17, 2016, 11:13 AM Post #1 of 3 (3160 views) 2003 5.3 suburban P0171 and P0174 Sign In Changed both upstream sensors. Bank one sensor fluctuates much lower milivolts than Bank two sensor. Seems to run too good for vacum leak. Hammer Time Ultimate Carjunky / Moderator Jan 17, 2016, 11:47 AM Post #2 of 3 (3153 views) Re: 2003 5.3 suburban P0171 and P0174 Sign In Quote Seems to run too good for vacum leak. I don't know where you get that idea. Those codes simply mean that the computer has reached it's adaptive limit in it's attempt to maintain 14.7:1 air/fuel ratio. Vacuum leaks or intake snorkel leak are the #1 causes of thise codes. The 0/2s are the very least likely causes, especially when it's both banks. You need to have the engine smoke tested. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. (This post was edited by Hammer Time on Jan 17, 2016, 11:48 AM) Tom Greenleaf Ultimate Carjunky / Moderator Jan 17, 2016, 11:49 AM Post #3 of 3 (3150 views) Re: 2003 5.3 suburban P0171 and P0174 Sign In Just because those codes come up doesn't mean toss the O2 sensors as you've found out - common mistake. ************************************ Fault Code Definition OBD II P0171 Fuel System Too Lean (Bank 1) OBD II P0174 Fuel System Too Lean (Bank 2) Symptoms Check Engine Light will illuminate In some cases, no adverse conditions may be noticed by the driver In other cases, there may be performance problems, such as a lack of power on acceleration and some "coughing" or misfiring The vehicle may have trouble idling, especially when warm or when sitting at a stoplight Common Problems That Trigger the P0171 and P0174 Code PCM software needs to be updated Vacuum leaks (Intake Manifold Gaskets, vacuum hoses, PCV hoses, etc.) Mass Airflow Sensor (MAF) Plugged Fuel Filter or weak Fuel Pump Plugged or dirty Fuel Injectors Common Misdiagnosis Oxygen Sensors Polluting Gases Expelled ************************************ Now you can check the more common reasons and add checking fuel pressure to the things listed above not always the fuel pump either, T   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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