Trouble Code 171 Bank 1 - JeepForum.com

 
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post #1 of 3 Old 03-18-2012, 07:02 AM Thread Starter
Basslicks
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1992 XJ Cherokee 
 
Join Date: Mar 2011
Location: Ocala
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Trouble Code 171 Bank 1

Hey all, I'm posting this for a friend.

He has an 03 Liberty with the 3.7L and it's throwing trouble code 171 Bank 1. I did a search on here and someone mentioned something about it being lean if that's the code. He did not mention on how to fix it. I told my friend that it's most likely an 02 sensor. Can anyone confirm this please?

Thanks


Justin<>< - Mal. 3:6 / 92 XJ 4.0, AW4, NP231, HPD30, D35, 3.5" lift, 15x8 UW Gauntlets, 32" Mudstars
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post #2 of 3 Old 03-18-2012, 08:20 AM
streetglideok
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2005 KJ Liberty 
 
Join Date: Jul 2011
Location: Castle Pines
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Maybe, maybe not. P0171 says bank 1 fuel trims indicate a very lean condition, usually +20%. Question 1 is, is the fuel trims on bank 2 reading normal, +/- 5%, or they just under the threshold? If they are in fact normal, then your problem is confined to bank 1. Could be a faulty O2 sensor, could be an injector, or injectors on that bank partially clogged, causing an issue. If you or your friend do decide to replace it and roll the dice, dont buy one of those junk bosch sensors from AZ, etc. Get an NTK brand, or an oe sensor from the dealer. If you dont... youll be sorry...
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post #3 of 3 Old 03-24-2012, 10:25 AM Thread Starter
Basslicks
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Join Date: Mar 2011
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thanks for the info.... I'll pass this along to him

Justin<>< - Mal. 3:6 / 92 XJ 4.0, AW4, NP231, HPD30, D35, 3.5" lift, 15x8 UW Gauntlets, 32" Mudstars
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