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2003 5.3 suburban P0171 and P0174
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Poncho2
New User
Jan 17, 2016, 11:13 AM
Post #1 of 3
(2600 views)
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2003 5.3 suburban P0171 and P0174
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Changed both upstream sensors. Bank one sensor fluctuates much lower milivolts than Bank two sensor. Seems to run too good for vacum leak.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jan 17, 2016, 11:49 AM
Post #3 of 3
(2590 views)
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Re: 2003 5.3 suburban P0171 and P0174
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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 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
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