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john, The Car Guy
Category: Toyota
Satisfied Customers: 16051
Experience:  ase tech over 15 years in the field
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code p0171 2000 toyota 4Runner with a 3.4L

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code p0171 2000 toyota 4Runner with a 3.4L

Hi . Thank you for asking your question on JustAnswer.your issue here is most likely a bad mass air flow sensor, very common on these

If you have no leaks replacement of the mass airflow filter will be in order. You can try cleaning it first. Remove the MAF using special throttle body or maf cleaner cleaning the maf works 50% of the time...Thank you again for trusting us with your problem. John aka eauto

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