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P0101 Mass air flow circuit range/performance

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Mass air flow circuit range/performance, readable through chat.

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System
Fuel / air
Component
Mass air flow sensor

Symptoms

  • Check engine light on
  • Slower than normal accelerator response, reduced power
  • Rough or unstable idle
  • Stalling at idle or when stopping
  • Hesitation when accelerating
  • Higher fuel use

Common causes

  • Intake air leak after the mass air flow sensor
  • Failed or contaminated mass air flow sensor
  • Engine control software not current
  • Uneven airflow through the sensor
  • Mass air flow sensor harness or connector fault
  • PCV valve fault
  • EVAP pressure sensor fault or EVAP leak

Guides for this code

Pencil sketch of a Nissan Pathfinder in a garage
Diagnostics & Repair

P0101 on a 2017-2020 Nissan Pathfinder: MAF Fault, Causes, Fix

JC Landry · Oct 27, 2026

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Answers come from the factory manual for your make, model and year, with the page cited. Join the waitlist and we will email you when a spot opens up.