Hi there
Typically this code is not a result of any external temp issues. The code is for a lean fuel mixture on bank 1. The common issues are a vacuum leak, bad front O2 sensor or low fuel pressure. Here is some more info for you.
P0171 OLDSMOBILE - Fuel Trim System Lean Bank 1 Read more: https://www.autocodes.com/p0171_oldsmobile.html
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