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P0300 Random/Multiple Cylinder Misfire Detected

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Random/Multiple Cylinder Misfire Detected, readable through chat.

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System
Ignition
Component
Spark plugs & coils

Symptoms

  • Lack of power or hesitation
  • Check engine light on
  • Check engine light flashing
  • Rough or unstable idle
  • Rough running on a cold start

Common causes

  • Worn or fouled spark plugs
  • Ignition coil fault
  • Fuel injector fault or contaminated fuel
  • Vacuum or intake air leak
  • Low compression or carbon buildup

Guides for this code

2016-221 Honda Civic sedan in a garage with a floor jack and tires
Diagnostics & Repair

P0300 on a 2016-2018 Honda Civic 1.5T: Misfire, Causes, Fix

JC Landry · Oct 30, 2026
Honda CR-V (5th-gen)
Diagnostics & Repair

Honda CR-V 1.5T oil dilution: fuel in the oil, P0172 and P0300 codes, and Honda’s software update

JC Landry · Oct 30, 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.