Practice question

What is the primary indicator of a faulty Mass Air Flow (MAF) sensor during an engine diagnostic check?

  1. A constant high-voltage oil pressure sensor signal output
  2. Erratic or static MAF sensor Grams per Second (g/s) readings on a scanner that do not increase when engine RPM rises
  3. A mechanical squealing noise coming from the water pump belt drive pulley
  4. The transmission shifting sluggishly when descending steep road grades

Answer: B — Erratic or static MAF sensor Grams per Second (g/s) readings on a scanner that do not increase when engine RPM rises

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