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Which fault code family reports a misfire?

  • A.P0420
  • B.P0171, which reports that the system is running lean and is therefore the code logged when a cylinder misfires
  • C.P0300 and the cylinder specific codes that follow it
  • D.P0100, which reports a fault within the air mass measurement circuit of the engine management system

Answer: C

P0300 is a random misfire and P0301 upward identify the cylinder. A misfire genuinely can set a lean code because unburnt oxygen reaches the sensor, which makes the last option a real secondary consequence. The shared behaviour explains why these belong together and the differences explain why both exist. The order in which the effects act is what decides the outcome, so it is worth establishing first. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

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