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DTC P0171 and P0174 Too Lean

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  #1  
Old 02-08-2016 | 03:56 PM
pgoodrich's Avatar
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Three Wheeling
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From: Temecula, CA
Default DTC P0171 and P0174 Too Lean
Hello,
I just received these codes the other day. I checked for any leaks but didn't find any. I could hear the PCV air flowing but no leaks. Two years ago I replaced the PCV and MASS for p0171. Now two codes are present. Time for a new MASS again or ...

Some logs from IID tool. What do you all think?
 
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  #2  
Old 02-08-2016 | 07:07 PM
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Rock Crawling
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Lean codes could mean anything...
Check for any leaks on harmonic air intake, air filter screws, O straps,oil cap and believe tr or not , dipstick's o ring.OnLR3 MAF sensor is usually associated with PO101 code.
 
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  #3  
Old 02-08-2016 | 07:23 PM
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Dirty injectors
 
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  #4  
Old 02-08-2016 | 08:43 PM
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Three Wheeling
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Originally Posted by jafir
Dirty injectors
Do you clean with bg44k or use special cleaner directly into the fuel rail?
 
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  #5  
Old 02-08-2016 | 08:58 PM
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Both.
 
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