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code problems

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dmccra
New User

Jan 21, 2014, 12:14 AM

Post #1 of 3 (1896 views)
code problems Sign In
 year of vehicle,2005 make chevy,cobalt 2.2, 104,000 mile Every once in a while, maybe about once a yr. My engine check light come on. The code reader
reads read 2 codes 171,po171 The engine runs great though, so I clear the code
with the code reader then the engine check light goes off It stay off for about another yr. The research I did points to the maf sensor. What is your opinion on this


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 21, 2014, 3:34 AM

Post #2 of 3 (1876 views)
Re: code problems Sign In
That means the engine is running too lean and the computer has reached it's adaptive limits/ Erasing the code doesn't resolve anything. You need to find the cause of the lean mixture. Look for vacuum and air leaks first.



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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.



Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jan 22, 2014, 6:27 PM

Post #3 of 3 (1828 views)
Re: code problems Sign In
You also need to look at what they call freeze frame data when the codes are set with an enhanced scan tool. The freeze frame data has a list of data stream parameters that was recorded when the code triggered. A good tech can use that information to see what kind of lean condition it is and possibly determine how to duplicate it.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jan 22, 2014, 6:28 PM)





 
 
 






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