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Q:

toyota corolla 2002 code p0171
on 2002 Toyota Corolla

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
check engine light
(2) Answers
po171-bank 1 system lean.Start by checking for vacuum leaks.Don't fall for the oxygen sensor diagnosis that many parts stores have told many of my customers.9 times out of 10 it is a vacuum leak.
in agreement w/ bmdouble as most likely-will add contaminated maf sensor/restricted fuel filter as other possibilities if no vacuum leaks are found.