2014 Impala 2LTZ - P0171 & P0174
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CF Senior Member
Joined: Oct 2006
Posts: 464
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From: Massachusetts
2014 Impala 2LTZ - P0171 & P0174
Right out of nowhere, the check engine light came on in my 2014 Impala 2LTZ. I scanned it and found it had P0171 - Fuel System Lean Bank 1 & P0174 - Fuel System Lean Bank 2. I broke open the service manual I have, only to find there could be many things that cause these DTCs. I did not want to shoot the parts cannon at it. So I went off to my friendly dealer, (glad I did). They did some checking and found the inlet hose # 20885923 had a crack/tear in it that was allowing un-metered air into the system. I also found it was still covered for me under the extended warranty. I wanted to post this here just in case someone else runs across this problem on their Impala, it could save you some steps.
CF Monarch
Joined: Oct 2017
Posts: 4,605
Likes: 269
From: USA
Right out of nowhere, the check engine light came on in my 2014 Impala 2LTZ. I scanned it and found it had P0171 - Fuel System Lean Bank 1 & P0174 - Fuel System Lean Bank 2. I broke open the service manual I have, only to find there could be many things that cause these DTCs. I did not want to shoot the parts cannon at it. So I went off to my friendly dealer, (glad I did). They did some checking and found the inlet hose # 20885923 had a crack/tear in it that was allowing un-metered air into the system. I also found it was still covered for me under the extended warranty. I wanted to post this here just in case someone else runs across this problem on their Impala, it could save you some steps.
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