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p0171 and p0101 2004 Chevy Silverado

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Jul 12, 2021, 3:46 PM

Post #1 of 2 (1085 views)
p0171 and p0101 2004 Chevy Silverado Sign In


2004 Chevy Silverado 4.8L 200K miles
I could use some guidance on how to troubleshoot two engine codes that my truck has. P0101 and P0171. I erased the codes, unfortunately. This is what I have done thus far:
-Inspected the Air filter (it is clean)
- Cleaned the MAF sensor with MAF cleaner.
- Took live readings with my Zurich ZR8 code reader
The LTFT1 and LTFT2 hover around +18% when engine warm and idling around 600 RPM.
- The MAF values are responsive to changes in engine RPM.
I don't have any special tools to check for vacuum leaks.
What are my next steps?

(This post was edited by azurite2005 on Jul 12, 2021, 4:17 PM)

Hammer Time
Ultimate Carjunky / Moderator
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Jul 12, 2021, 4:41 PM

Post #2 of 2 (1069 views)
Re: p0171 and p0101 2004 Chevy Silverado Sign In

You have a lean code and a MAF code. My guess is there is something wrong with either the MAF or the snorkel is sucking air somewhere between the sensor and the throttle body.


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.

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